This process is an integral part of being human. Let's face it. There is little in the world more initially delicious than sin. Think only of certain sinful moments in your own life for proof. Yet for every bit as delectable as sin is, it is equally lacking in spiritual substance.
Sin is empty calories.
It is a joy we do not deserve. It tastes great, but it makes your butt big and gives you a headache if it is all you live on. With sin comes experience. All vice is fraught with pain, which leads us to be basically decent. Of course we could sleep late, be on the dole and have torrid affairs, but we would feel very empty indeed.