What is sin?
The word is familiar to Christians, but it is often misunderstood.
Some people think of sin only as committing terrible crimes. Others understand sin mainly as breaking religious rules. Still others regard the idea of sin as an outdated concept associated with guilt and judgment.
The Bible presents a much deeper picture.
Sin includes our actions, words, desires, attitudes, and failures to do what is right. At its deepest level, sin is rebellion against God and a failure to live according to His holy character and will.
Understanding sin is essential to understanding Christianity because we cannot fully understand the Gospel until we understand what humanity needs to be saved from.
Sin Is the Transgression of God's Law
One of Scripture's clearest definitions appears in 1 John 3:4:
"Whosoever committeth sin transgresseth also the law: for sin is the transgression of the law."
God is our Creator and has the authority to distinguish good from evil.
When human beings reject God's commands and choose what He forbids, they sin.
Sin therefore is not merely violating a human tradition. It ultimately concerns our relationship with God.
Sin Is Also Failing to Do What Is Right
Sin is not limited to doing something forbidden.
The Bible also describes the failure to do what we know is right as sin.
James 4:17 says:
"Therefore to him that knoweth to do good, and doeth it not, to him it is sin."
This means there are sins of commission and sins of omission.
We can sin by doing what is wrong.
We can also sin by refusing to do what is right.
If we have the ability and responsibility to show mercy, speak truth, help someone in need, seek justice, forgive, or obey God, deliberately refusing to do so can itself become sinful.
Sin Is Against God
Sin can deeply hurt other people, but Scripture teaches that sin is ultimately against God.
After David's terrible sins involving Bathsheba and Uriah, he prayed in Psalm 51:
"Against thee, thee only, have I sinned, and done this evil in thy sight."
David had certainly sinned against human beings. His actions caused enormous harm.
Yet he recognized that behind every violation of another human being stands an even deeper offense against the God who created that person and commanded righteousness.
Sin is therefore personal. It damages our relationship with our Creator.
Where Did Human Sin Begin?
Genesis 3 describes the entrance of human rebellion into the biblical story.
God had given Adam and Eve a command.
The serpent questioned God's Word and encouraged them to distrust God.
Adam and Eve chose disobedience.
The immediate consequences included shame, fear, hiding, blame, broken relationships, and judgment.
The story demonstrates a pattern that continues throughout human history.
Sin begins when human beings reject God's authority and attempt to determine good and evil independently of Him.
Sin Is More Than Bad Behavior
The Bible does not treat sin merely as an external behavior problem.
Jesus repeatedly directed attention toward the human heart.
In Mark 7, He taught that evil thoughts, sexual immorality, theft, murder, adultery, greed, deceit, pride, and other evils proceed from within.
This means changing outward behavior alone cannot completely solve humanity's problem.
Our actions reveal something deeper about our desires, loyalties, and hearts.
The biblical solution therefore involves more than learning better manners.
We need spiritual transformation.
Sin Can Involve Our Thoughts
Jesus' teaching in the Sermon on the Mount demonstrates that God's concern reaches beyond visible behavior.
Jesus addressed anger as well as murder.
He addressed lust as well as adultery.
God sees not only what people do publicly but what occurs within the heart.
A person may appear morally respectable while privately being controlled by hatred, jealousy, pride, greed, lust, or bitterness.
Biblical holiness therefore concerns the whole person.
Sin Can Involve Our Words
Our speech also has moral significance.
Lying, slander, cruel speech, gossip, false accusations, and words intended to destroy another person's reputation can all become expressions of sin.
Jesus taught that our words reveal what fills our hearts.
James describes the extraordinary power of the tongue and warns about its destructive potential.
Christian obedience therefore includes learning to speak truthfully, graciously, and responsibly.
Sin Can Involve Our Actions
Scripture identifies many actions as sinful.
These include murder, adultery, sexual immorality, theft, idolatry, drunkenness, dishonesty, oppression, injustice, and many other forms of wrongdoing.
Galatians 5 contrasts the works of the flesh with the fruit of the Spirit.
But biblical teaching about sin should never become merely a list of other people's failures.
Jesus warned against hypocrisy.
We must examine our own hearts before using Scripture primarily to condemn our neighbors.
Sin Can Involve What We Fail to Do
The Bible repeatedly connects righteousness with positive responsibilities.
We are called to love God.
We are called to love our neighbor.
We are called to forgive.
We are called to care for people in need.
We are called to act justly and show mercy.
Therefore, Christian morality cannot be reduced to saying, "I did not murder, steal, or commit adultery."
The question is also whether we have done the good God calls us to do.
Sin Is Falling Short of God's Glory
Romans 3:23 provides one of the best-known descriptions of humanity's condition:
"For all have sinned, and come short of the glory of God."
God's standard is not simply whether we are slightly better than another person.
We often compare ourselves with people whose behavior appears worse than ours.
But comparison with other sinners cannot make us righteous before a holy God.
The biblical standard is God's righteousness.
Against that standard, every human being falls short.
Is Everyone a Sinner?
According to the New Testament, yes.
Romans 3 does not divide humanity into one group that needs salvation and another group that has achieved moral perfection.
It concludes that all have sinned.
This truth should produce humility.
Christianity does not teach that Christians are naturally better people who have earned God's acceptance.
The Gospel begins with the recognition that all of us need grace.
Are All Sins Exactly the Same?
All sin is serious because all sin opposes God's holiness.
However, Scripture does not require us to conclude that every sinful action has exactly the same earthly consequences or moral gravity.
Jesus spoke of greater sin in John 19:11 and of differing degrees of accountability in other passages.
Murder and an angry thought are both morally significant, but they do not produce identical consequences for another human being.
We should therefore avoid two extremes.
We should not minimize sins that appear small.
But neither should we pretend that every wrongdoing causes exactly the same degree of harm.
What Is Original Sin?
Christian theology uses the expression "original sin" to describe humanity's fallen condition in connection with Adam's first transgression.
Romans 5 places Adam and Christ in contrast.
Through Adam, sin and death entered the human story.
Through Christ comes the hope of righteousness and life.
Different Christian traditions explain aspects of original sin differently, particularly questions concerning inherited guilt and the precise relationship between Adam's sin and his descendants.
But historic Christian traditions broadly agree that humanity does not begin from a condition of moral perfection. We belong to a fallen human race in need of God's grace.
Sin Damages Our Relationship With God
Sin is serious because God is holy.
Isaiah 59 describes sin as creating separation between sinful people and God.
This does not mean God ceases to know where sinners are.
It describes broken fellowship and alienation caused by rebellion.
Humanity's deepest problem therefore cannot be solved merely through greater education, technology, wealth, or political organization.
Those things may improve aspects of human life, but they cannot reconcile sinners to God.
Sin Damages Other People
Sin is never merely private.
A lie can destroy trust.
Adultery can devastate a family.
Greed can exploit workers and the poor.
Gossip can destroy reputations.
Violence can permanently alter lives.
Corruption can harm entire communities.
Pride can destroy relationships.
Even sins hidden from public view can shape our character and eventually affect how we treat other people.
This is one reason Scripture commands us to love our neighbor.
Sin Damages Us
Sin also damages the person committing it.
Repeated sinful choices can become habits.
Habits can become patterns of bondage.
A person who repeatedly lies may gradually become comfortable with deception.
Someone who continually feeds resentment can become controlled by bitterness.
Someone who repeatedly gives himself to greed may become increasingly dissatisfied regardless of how much he possesses.
Sin promises freedom but often produces slavery.
Jesus said that whoever commits sin becomes the servant of sin.
Sin and Death
Romans 6:23 says:
"For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord."
This verse places two realities side by side.
Sin leads toward death.
God offers eternal life through Christ.
The biblical story connects sin with both physical death and spiritual separation from God.
This is why salvation is more than moral self-improvement.
Humanity needs rescue.
Can Good Works Remove Our Sin?
Good works matter greatly in Christian life, but Scripture does not present them as a way of purchasing forgiveness.
A person cannot erase yesterday's wrongdoing simply by performing an unrelated good deed today.
Imagine someone stealing from another person and then donating money somewhere else.
The donation does not make the theft righteous.
Likewise, our good actions do not cancel our guilt before God.
According to the Gospel, forgiveness is an act of God's grace.
Why Can't God Simply Ignore Sin?
We might ask why a loving God cannot simply overlook evil.
But imagine a judge who continually ignored murder, abuse, exploitation, and corruption.
We would not call such a judge loving.
We would call that judge unjust.
God's goodness includes His justice.
Because God is holy and righteous, evil matters to Him.
The Christian Gospel is remarkable because God does not solve the problem of sin by pretending sin does not matter.
He deals with it through Jesus Christ.
Jesus Came to Save Sinners
Before Jesus was born, Joseph was told concerning Mary:
"Thou shalt call his name JESUS: for he shall save his people from their sins."
This statement in Matthew 1:21 gives us an important explanation of Christ's mission.
Jesus did not come merely to provide inspirational teaching.
He came to save.
The problem from which humanity needs salvation is fundamentally connected with sin.
Jesus Lived Without Sin
The New Testament presents Jesus as fundamentally different from the rest of fallen humanity.
Hebrews describes Him as tempted yet without sin.
First Peter says that He did no sin.
Second Corinthians says that He knew no sin.
This matters because Jesus is not presented merely as another sinner trying to help other sinners.
He is the sinless Savior.
Jesus Died for Our Sins
The cross stands at the center of the Christian answer to sin.
First Corinthians 15 summarizes the Gospel by declaring that Christ died for our sins according to the Scriptures, was buried, and rose again.
First Peter describes Christ bearing our sins.
Isaiah 53 provides the Old Testament background of the suffering servant bearing the iniquities of others.
Christians understand the cross as the place where God's holiness, justice, mercy, and love meet.
Sin is not ignored.
Grace is offered at enormous cost.
Jesus Rose From the Dead
The Christian Gospel does not end at the cross.
Jesus rose from the dead.
The resurrection declares His victory over sin and death and forms the foundation of Christian hope.
Christians do not merely believe that Jesus died as an example of sacrifice.
They believe He is the risen Lord who gives eternal life to those who trust in Him.
What Is Repentance?
The biblical response to sin includes repentance.
Repentance involves a genuine turning of the heart and life toward God.
It is more than feeling embarrassed because we were caught.
True repentance acknowledges sin, agrees with God's judgment concerning it, seeks His mercy, and turns toward obedience.
Jesus called people to repent and believe the Gospel.
Repentance does not purchase salvation.
It is the proper response of a sinner turning toward the God who offers mercy.
What Is Confession?
Confession means acknowledging our sins honestly before God.
First John 1:9 gives Christians a wonderful promise:
"If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness."
Confession rejects self-deception.
Instead of defending ourselves, blaming others, or pretending we have not sinned, we bring our failure into the light before God.
Can God Forgive Serious Sin?
The Bible contains examples of people guilty of serious wrongdoing who nevertheless experienced God's mercy.
David committed adultery and arranged circumstances leading to Uriah's death.
Paul persecuted Christians before becoming an apostle.
Peter denied Jesus.
The Gospel does not teach that sin is insignificant.
It teaches that God's grace is greater than the sinner's ability to save himself.
No one should use grace as permission to continue deliberately in evil.
But neither should a repentant sinner conclude that God's mercy is available only to people whose past looks respectable.
Does Grace Mean Sin No Longer Matters?
No.
Paul directly rejected the idea that grace gives Christians permission to continue in sin.
Romans 6 asks whether believers should continue in sin so that grace may increase and answers strongly against it.
Grace does not make sin good.
Grace rescues sinners from sin's guilt and power and begins transforming their lives.
Christians still struggle with sin, but they are called not to make peace with it.
Christians Still Need to Confess Sin
Becoming a Christian does not mean instantly reaching sinless perfection.
First John was written to believers and still speaks about confession and cleansing.
Christians continue growing in holiness throughout their lives.
When we sin, we should not hide from God.
We should confess, repent, receive His forgiveness, make appropriate restitution where possible, and continue walking with Christ.
Sin Should Produce Humility, Not Self-Righteousness
A proper understanding of sin should make Christians humble.
If all have sinned and salvation is by grace, there is no basis for spiritual pride.
Christians should be able to call evil what it is without acting as though they themselves have never needed mercy.
Jesus repeatedly confronted religious hypocrisy.
We must therefore examine our own hearts while speaking truth about sin.
Sin Is Serious, but Grace Is Greater
If we speak about sin without grace, Christianity can sound like nothing more than condemnation.
If we speak about grace without sin, the cross becomes unnecessary.
The Gospel requires us to understand both.
Sin is serious because God is holy.
Grace is extraordinary because God loves sinners.
Romans 5 teaches that where sin abounded, grace abounded much more.
This does not glorify sin.
It glorifies the God who saves.
What Should We Do About Sin?
We should first stop pretending that sin belongs only to other people.
Scripture says that all have sinned.
We should examine ourselves honestly before God.
We should confess our sins.
We should repent and turn from them.
We should trust in Jesus Christ rather than our own moral achievements.
And having received grace, we should seek to live lives shaped by love, holiness, truth, justice, mercy, and obedience to God.
What Is Sin?
We can now summarize the biblical picture.
Sin is rebellion against God.
Sin is transgression of God's law.
Sin is failing to do the good we know we should do.
Sin can occur in thought, desire, word, action, and omission.
Sin damages our relationship with God, harms our neighbors, corrupts us, and leads toward death.
And sin is universal: all humanity stands in need of God's grace.
But this is not the end of the Christian message.
Conclusion
The question "What is sin?" ultimately leads us to the question "What has God done about sin?"
The Bible does not minimize human evil.
It tells us that all have sinned and fallen short of God's glory.
We cannot rescue ourselves simply by comparing ourselves with worse people or accumulating enough good deeds.
But God has not abandoned sinners.
According to the Gospel, Jesus Christ came into the world to save sinners. He lived without sin, died for our sins, was buried, and rose again.
Through Christ, forgiveness and reconciliation with God are offered to sinners.
Therefore, recognizing our sin should not drive us into hopelessness.
It should drive us toward repentance, faith, and the mercy of God revealed in Jesus Christ.
"For all have sinned, and come short of the glory of God."
"But the gift of God is eternal life through Jesus Christ our Lord."