What is the simplest definition of sin?

Falling short of what God intends — in action, in word, in thought, and in what we fail to do. Romans 3:23 puts it as falling short of the glory of God. The New Testament word most often translated sin carries the sense of missing a mark.

Are some sins worse than others?

Scripture treats sins as differing in seriousness and consequence — Jesus speaks of greater sin in John 19:11. But it also teaches that any sin is enough to separate a person from a holy God, which is why James 2:10 says breaking the law at one point makes someone accountable for all of it.

Is sin just breaking rules?

The rules matter, but Scripture frames sin relationally first. Psalm 51:4 has David say against God alone have I sinned, even though he had gravely wronged people. Sin damages relationships horizontally and vertically at once.

If I am basically a good person, do I still need forgiveness?

The Bible does not deny that people do genuine good — it affirms all people bear God's image (Genesis 1:27). Its claim is narrower and harder: that none of us has lived up to even our own standard, let alone God's (Romans 3:10-12).

Does calling something sin mean condemning the person?

Not in Christian teaching. The New Testament's sharpest warnings about sin are addressed to believers about themselves. Anyone writing about sin is describing a condition they share.

What Is Sin?

Before the good news makes sense, the bad news has to be honest.

This is the part of the Christian message people most often find offensive, and it is worth stating carefully rather than loudly. The Bible's claim about sin is not that human beings are worthless. It is that something has gone wrong that we cannot fix from the inside.

Missing the mark

The word most often translated sin in the New Testament carries the ordinary sense of missing a target. Paul uses it that way in the best-known summary: "all have sinned and fall short of the glory of God" (Romans 3:23). The image is not of a monster but of an arrow that did not reach.

That framing matters, because it means sin is measured against something. The standard is not a community's opinion or an era's manners. It is the character of God Himself.

More than actions

Jesus consistently pushed the definition inward. Murder was already prohibited; He located the same root in contempt. Adultery was already prohibited; He located it in the settled intention of the heart (Matthew 5:21-28). The effect was to close the exit that lets a person feel innocent on a technicality.

Scripture also treats failure to act as sin — "whoever knows the right thing to do and fails to do it, for him it is sin" (James 4:17). Most of us are more comfortable with a definition limited to things we did.

A relationship, not just a rulebook

After arranging the death of a man whose wife he had taken, David wrote: "Against you, you only, have I sinned" (Psalm 51:4). Taken alone that sounds like a man evading responsibility for a very human crime. In context it is the reverse — he is recognising that beneath the injuries he caused to people lies an offence against the God who made them.

This is why Christians speak of sin as separation (Isaiah 59:2) rather than only as misconduct. The problem is not merely a bad record. It is a broken relationship with the one in whom we live and move and have our being.

Why the diagnosis is so sweeping

Paul assembles a series of Old Testament quotations to make the point that this is a universal condition, not a category of especially bad people: "None is righteous, no, not one" (Romans 3:10-12). The claim is deliberately levelling. It removes the possibility of a moral league table in which some of us are safe.

Christians have long disagreed about the mechanism — how exactly this condition passes to every person, and how much of the will remains free under it. Those debates are real and old. What the major historic traditions hold in common is the observation itself: that every person, given time, falls short of even their own standard.

What sin is not

Sin is not the same as being human. The New Testament is clear that Jesus was fully human and without sin (Hebrews 4:15), so the two cannot be identical. Bodies, appetites, emotions and limitations are part of a creation God called good.

Sin is also not the same as suffering. Jesus explicitly rejected the assumption that misfortune proves guilt (Luke 13:1-5, John 9:1-3). If you are unwell, bereaved or struggling, Scripture does not invite you to read that as a verdict.

Why this is the setup for good news

A diagnosis is only cruel if there is no treatment. The reason Christians insist on being honest about sin is that the New Testament immediately follows the diagnosis with a remedy: the very next line after "all have sinned" is "and are justified by his grace as a gift" (Romans 3:24).

The bad news is only ever told here as the first half of a sentence. The second half is the cross.

Common Questions

What is the simplest definition of sin?: Falling short of what God intends — in action, in word, in thought, and in what we fail to do. Romans 3:23 puts it as falling short of the glory of God. The New Testament word most often translated sin carries the sense of missing a mark.
Are some sins worse than others?: Scripture treats sins as differing in seriousness and consequence — Jesus speaks of greater sin in John 19:11. But it also teaches that any sin is enough to separate a person from a holy God, which is why James 2:10 says breaking the law at one point makes someone accountable for all of it.
Is sin just breaking rules?: The rules matter, but Scripture frames sin relationally first. Psalm 51:4 has David say against God alone have I sinned, even though he had gravely wronged people. Sin damages relationships horizontally and vertically at once.
If I am basically a good person, do I still need forgiveness?: The Bible does not deny that people do genuine good — it affirms all people bear God's image (Genesis 1:27). Its claim is narrower and harder: that none of us has lived up to even our own standard, let alone God's (Romans 3:10-12).
Does calling something sin mean condemning the person?: Not in Christian teaching. The New Testament's sharpest warnings about sin are addressed to believers about themselves. Anyone writing about sin is describing a condition they share.

Keep Reading

What the Bible Says About Sin — Scripture references by category
Repentance — Key verses on turning back
Why Did Jesus Die? — What God did about it

Where to Go From Here

Nobody follows Jesus alone. Whatever stage you are at, there is a next step.

Respond to Christ What the Bible says about being saved Find a Church Christians near you, in person Join a Bible Study Read Scripture with others Request Prayer Ask believers to pray with you

Still working through questions? The apologetics library deals with the historical and philosophical objections in depth, and honest questions are welcome here.