It is true enough, of course, that a pungent happiness comes chiefly in certain passing moments; but it is not true that we should think of them as passing. . . To do this is to rationalize happiness, and therefore to destroy it. Happiness is a mystery like religion, and should never be rationalized. . . A man may have, for instance, a moment of ecstasy in first love, or a moment of victory in battle. . . The cause which the flag stands for may be foolish and fleeting; the love may be calf-love, and last a week. But the patriot thinks of the flag as eternal; the love thinks of his love as something that cannot end. These moments are filled with eternity; these moments are joyful because they do not seem momentary. . . Man cannot love mortal things. He can only love immortal things for an instant.
– Heretics (1905).