Since most of us are born with an abundance of natural desires, it isn't strange that we often let these far exceed their intended purpose. When they drive us blindly, or we willfully demand that they supply us with more satisfactions or pleasures than are possible or due us, that is the point at which we depart from the degree of perfection that God wishes for us here on earth. That is the measure of our character defects, or, if you wish, of our sins.