Did you know sins cooperate? They reinforce each other. And once one gets a foothold, the others become easier to welcome in.
That is part of what makes them so dangerous.
Pride commands the other vices like a tyrant. Envy can masquerade as “motivation.” Wrath can twist itself into “righteousness.”
Even a virtuous soul can find certain sins creeping in, subtly corrupting what would otherwise be good desires.
If we understand how the vices work together, we can fight them more intelligently. And we can fight them with more hope.
Sin begets sin
The Catechism states something that might surprise us but is actually surprisingly true:
“Sin creates a proclivity to sin; it engenders vice by repetition of the same acts. This results in perverse inclinations which cloud conscience and corrupt the concrete judgment of good and evil. Thus sin tends to reproduce itself and reinforce itself, but it cannot destroy the moral sense at its root.” (Catechism of the Catholic Church, 1865)
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Sin doesn’t merely stain one corner of life and politely stay there. It tends to spread. Small sins lead to bigger ones, and bigger sins spread sideways into habits, relationships, and patterns of thinking that begin to feel normal.
And we can see why.
None of us likes to be wrong. Like Adam and Eve, we instinctively shrink from our sin. It takes grace just to sit in the discomfort long enough to admit, “I need repentance.”
It takes even more grace to actually change. So instead of repentance, we often settle for something easier: rationalization.
"We tell ourselves it wasn’t wrath, because they deserved it.
We tell ourselves it wasn’t lust, because we didn’t go too far.
We tell ourselves it wasn’t gluttony, because everyone else was doing it.
But every excuse does something to the soul. It trains us to excuse the next sin, too." (Good Catholic series, Overcoming Deadly Sin).
And the more we practice that internal self-defense, the less clearly we see. Our judgment is clouded. Our senses are dulled.
Why this is actually a reason for hope
Taken together, the deadly sins form a kind of spiritual poison stronger than the sum of its parts.
So should that discourage us?
No. In truth, it reveals their weakness.
The vices depend on each other. They work best when they can overwhelm us, outnumber us, and make us feel like resistance is pointless.
But when we fight back against one vice, the whole alliance is weakened. And this can have a significant impact on the spiritual life.
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You can gain ground by attacking a neighboring vice, one that feeds or supports the primary one you’re trying to uproot.
For example, if lust is a battle, strengthening temperance and self-denial in other areas matters more than we think. Training the will through fasting and restraint makes the soul less fragile when temptation appears.
Or if wrath is the battle, it can help to examine what fuels it. Envy, pride, and the craving for recognition often feed anger like kindling feeds a fire. As those roots weaken, the flare-ups frequently lessen, too. And as we pray specifically for the virtue to fight those other sins, we shine a light on them and bring them into view.
This isn’t a strategy for giving up on the main fight. The point isn’t retreat. The point is to outflank the enemy.
Scripture shows how quickly vice multiplies
When it comes to the realities of sin, there is no better teacher than Sacred Scripture.
In 2 Samuel 11:1–27, we read the sobering story of King David and Bathsheba, which is an example of how one sin quickly gives birth to another, and then another, and then another again.
To make a long Biblical story short, David begins in a kind of slothful comfort. While kings go out to battle, he stays behind. From that position of idleness, he indulges lust.
Once lust is acted upon, the sin does not remain contained.
Then comes deceit as he tries to cover what he’s done. Then manipulation. Then cruelty. And finally, he orchestrates Uriah’s death.
This is one reason we must take even “small” compromises seriously. Not because God is stingy with mercy, but because sin is never content to remain small.
Fighting the web of sin
Does this sound a bit overwhelming? It should not, because the truth is that if the deadly sins support each other, the opposite is also true. Virtues support each other, too.
We all know this to be true when we really think about it. When you grow in humility, you become less vulnerable to pride. When you grow in temperance, gluttony loses strength. When you pursue charity, you are less vulnerable to envy and wrath.
The practical path forward is not complicated, even though it is demanding:
Tell the truth about sin quickly, without negotiating with it.
Choose one concrete practice that weakens the network of vice in your own heart.
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Return to grace without delay, through confession and prayer. If it has been a long time, remember that the enemy loves procrastination. But most of all, remember that God is merciful! So make it a point this Lent to go to confession.
And above all, do not lose heart. Sin can reproduce itself and reinforce itself, but it cannot destroy the moral sense at its root. And virtue also reproduces.
Grace is stronger. St. Paul says in Romans 5:20, "...but where sin increased, grace abounded all the more." And God never asks us to fight alone.
Go deeper: Overcoming Deadly Sin
If you want a guided path through the vices and the virtues that conquer them, our Good Catholic series Overcoming Deadly Sin walks through the deadly sins with clarity and strategy, helping you identify where sin hides and how grace uproots it. Much of this article comes from the session devoted to "How the Deadly Sins Support Each Other".
