[P]sychologists have had some pretty rough things to say about the immaturity and narcissism of love in our marketing society, in which it is reduced to a purely egotistical need that cries out for immediate satisfaction or manipulates others more or less cleverly in order to get what it wants. But the plain truth is this: love is not a matter of getting what you want. Quite the contrary. The insistence on always having what you want, on always being satisfied, on always being fulfilled, makes love impossible. To love you have to climb out of the cradle, where everything is "getting," and grow up to the maturity of giving, without concern for getting anything special in return. Love is not a deal, it is a sacrifice. It is not marketing, it is a form of worship.
In reality, love is a positive force, a transcendent spiritual power. It is, in fact, the deepest creative power in human nature. Rooted in the biological riches of our inheritance, love flowers spiritually as freedom and as a creature response to life in a perfect encounter with another person. It is a living appreciation of life as value and as gift. It responds to the full richness, the variety, the fecundity of living experience itself: it "knows" the inner mystery of life. It enjoys life as an inexhaustible fortune. Love estimates this fortune in a way that knowledge could never do. Love has its own wisdom, its own science, its own way of exploring the inner depths of life in the mystery of the loved person. Love knows, understands and meets the demands of life insofar as it responds with warmth, abandon and surrender.
Thomas Merton. "Love and Need" in Love and Living. Naomi Burton Stone and Brother Patrick Hart, editors. New York: Farrar, Straus & Giroux, 1979: 30-31