Seize from every moment its unique novelty, and do not prepare your joys.
I believe it was Shakespeare, or possibly Howard Cosell, who first observed that marriage is very much like a birthday candle, in that 'the flames of passion burn brightest when the wick of intimacy is first ignited by the disposable butane lighter of physical attraction, but sooner or later the heat of familiarity causes the wax of boredom to drip all over the vanilla frosting of novelty and the shredded coconut of romance.' I could not have phrased it better myself.
A zoologist who observed gorillas in their native habitat was amazed by the uniformity of their life and their vast idleness. Hours and hours without doing anything. Was boredom unknown to them? This is indeed a question raised by a human, a busy ape. Far from fleeing monotony, animals crave it, and what they most dread is to see it end. For it ends, only to be replaced by fear, the cause of all activity. Inaction is divine; yet it is against inaction that man has rebelled. Man alone, in nature, is incapable of enduring monotony, man alone wants something to happen at all costs—something, anything.... Thereby he shows himself unworthy of his ancestor: the need for novelty is the characteristic of an alienated gorilla.