Though sin still lives in us, we must not live in any sin - we must fight against it. And we must know our sins so that we can fight against them.
We consider three particular sins Christians are liable to, and that therefore we must be on our guard against.
Sin is our greatest enemy and we must not make peace with it. Rather, we must kill it. This is the way we will show that we truly live and the only way we will be useful to the Lord.