What Is Sin, Really?

The short answer: Sin is more than breaking rules. It’s missing the mark God made us for, turning away from Him to run our own lives, and failing to love Him and other people as we should. It’s something we do, but also a power that holds us, and only Jesus can set us free from it.

“Sin” can sound like a church word for a list of banned things: swearing, lying, sneaking out. If that’s all it is, the cure would be simple: try harder, keep the rules. But the Bible’s picture is much bigger, and more serious. And it’s more hopeful.

Missing the mark

The most common words for sin in the Bible’s original languages can be used for missing a target. The book of Judges describes soldiers who “could sling a stone at a hair without missing” (Judges 20:16); the Hebrew word for “missing” there is the ordinary word for sin.

So sin isn’t only doing bad things. It’s falling short of what we were made for. Paul puts it like this: “all have sinned and fall short of the glory of God” (Romans 3:23). You were made to reflect God’s goodness, His love and His glory. Every time we fall short of that, even when nobody else notices, we miss the mark.

That means you can sin by not doing something too. “Anyone, then, who knows the right thing to do, yet fails to do it, is guilty of sin” (James 4:17).

Rebellion

But sin isn’t just a bad aim. It’s also a choice of direction. “We all like sheep have gone astray, each one has turned to his own way” (Isaiah 53:6). At its root, sin is saying to God: I’ll run my own life, thanks.

That’s why David, after he had hurt other people terribly, prayed, “Against You, You only, have I sinned” (Psalm 51:4). He had wronged people, but deepest of all he had turned his back on God. The Bible even calls sin “lawlessness” (1 John 3:4): living as if God has no say.

Broken love

Jesus summed up everything God asks in two commands: “Love the Lord your God with all your heart and with all your soul and with all your mind” and “Love your neighbor as yourself” (Matthew 22:37–39). So sin, at heart, is broken love. It’s loving the wrong things, loving the right things too much or too little, or loving ourselves most of all.

God describes it through Jeremiah like this: “They have forsaken Me, the fountain of living water, and they have dug their own cisterns— broken cisterns that cannot hold water” (Jeremiah 2:13). Sin isn’t just bad. It’s a terrible trade. We swap the real thing for something that leaks.

Not just acts, but a power

Here’s what the rule-list idea misses. Sin isn’t only things we do. It’s a power that gets a grip on us. God warned Cain, “sin is crouching at your door; it desires you” (Genesis 4:7), like an animal waiting to pounce. Jesus said, “everyone who sins is a slave to sin” (John 8:34).

You’ve probably felt this. You promise yourself you won’t do that thing again, and you do it anyway. Paul felt it too: “For I do not do the good I want to do. Instead, I keep on doing the evil I do not want to do” (Romans 7:19). Jesus said the trouble starts deep down: “For from within the hearts of men come evil thoughts” (Mark 7:21). Our behaviour is the fruit. The root is a heart turned away from God.

That’s why trying harder is never enough. You can’t free yourself from a power by being more determined. You need a rescuer.

The cure

Paul’s cry, “What a wretched man I am! Who will rescue me from this body of death?” is followed straight away by the answer: “Thanks be to God, through Jesus Christ our Lord!” (Romans 7:24–25).

Jesus deals with both sides of sin. On the cross He carried the guilt of it; Isaiah says “the LORD has laid upon Him the iniquity of us all” (Isaiah 53:6). And by His Spirit He breaks its power: “So if the Son sets you free, you will be free indeed” (John 8:36). Christians still struggle, but “sin shall not be your master” (Romans 6:14).

Taking sin seriously isn’t meant to crush you. A doctor tells you what’s wrong so that you can be healed.

Think about it: Which picture of sin do you find most helpful: missing the mark, rebellion, broken love or slavery? Why?

Go deeper: The Key Teachings of Martyn Lloyd-Jones — a London doctor who became a preacher argues that sin is not first a matter of things done but a condition of the heart, so moral reform can’t cure it, and that the Bible’s hard diagnosis is a mercy because it comes with a sure cure. Start with chapter 3, “What Is Really Wrong”.