Human desire...

Human desire differs from animal desire in that it is at root insatiable. Man is characterized by a hunger for the infinite, for an eternity of life, love and joy which, whether he knows it or not, can be nothing other than God. Assuming that God exists, it will follow that God is man's true end, for the appetite of a living organism shows its function. The stomach hungers for food because it's function is to digest food. As physical taste and hunger may often be mistaken as to their true object, desiring nothing but caviar instead of a balanced diet, man is often mistaken as to the goal of his life, desiring wealth, power or physical pleasure instead of God. But his real appetite continues to be God, for which these lesser goals are always unsatisfactory substitutes. Those who set their hearts on finite goals are always discontented; they must always have more and more and more of what they desire, and failing this are frustrated and miserable. Profound contentment is only enjoyed by animals and primitives, in which infinite hunger has not been awakened, and by the saints and mystics who have realized union with God. - Alan Watts