"When an unclean spirit goes out of a man, he goes through dry places, seeking rest; and finding none, he says, 'I will return to my house from which I came.' And when he comes, he finds it swept and put in order. Then he goes and takes with him seven other spirits more wicked than himself, and they enter and dwell there; and the last state of that man is worse than the first." (Luke 11:24-26)

A man who drank heavily was converted to Christ and lived victoriously for several weeks. One day as he passed the open door of a tavern, the pungent odor drifting out aroused his old appetite for liquor. Just then he saw this sign in the window of a nearby cafe: "All the buttermilk you can drink -- 25 cents!" Dashing inside, he ordered one glass, then another, and still another. After finishing the third he walked past the saloon and was no longer tempted. He was so full of buttermilk that he had no room for that which would be injurious to him. The lesson is clear: to be victorious over our evil desires, we must leave no opportunity for them to repossess us. (From Bible Illustrator)

Definitely, all new converts should replace their former evil way of life with good works; otherwise, they can quickly revert back to their old way and become worse than before their conversion. "Walk in the Spirit, and you shall not fulfill the lust of the flesh." (Gal. 5:16)