A boat doesn't sink because it is in the water; it stinks because the water gets into it. In the same way, we don't sink because we live in a sea of corruption, we sink when the sea of correction has gotten into us. We don't fail because we live in the world, we fail when the world has gotten into us.
It can happen without realizing it we become preoccupied with things of the world rather than things of Christ and little by little the chilling waters of the world creep in.
Just like any ship that has a pump constantly running and sucking out any water, we need to pump this water out by constant repentance. Don't let the world sink your ship... Repair and plug the holes with the word of God and the will of God!
"And the world is passing away, and the lust of it; but he who does the will of God abides forever.” (1 John 2:17)