Proverbs 26:11 speaks of a person who returns to the same sin habitually being just like a dog that returns to its vomit and eats it. As a dog owner, I can attest this is a disgusting canine practice, even if it does keep pet food bills down slightly. This passage calls a person who returns to their sin a fool. These are jolting words, especially in a politically correct and overly sensitive era like ours, where society has determined the cardinal commandment to be, "Thou shalt not offend".
Tim Challies points out a good post on habitual sin being like returning to your vomit and eating it. The whole post can be found here.
So, just as you wouldn't want to put vomit on your regular meal rotation, don't keep going back to the same sin again. Feast instead on God's Word. After all, we live by every word that proceeds from the mouth of God.