A godly man does not indulge sin. Though sin is in him, he is troubled at it and would gladly get rid of it. There is as much difference between sin in the wicked and sin in the godly—as between poison being in a serpent and poison being in a man. Poison in a serpent is in its natural place and is delightful—but poison in a man's body is harmful and he uses antidotes to expel it. So sin in a wicked man is delightful, being in its natural place—but sin in a child of God is burdensome and he uses all means to expel it.
Taken from the book The Godly Man's Picture by Thomas Watson 1666