We must learn to suffer whatever we cannot avoid. Our life is composed, like the harmony of the world, of discords as well as of different tones, sweet and harsh, sharp and flat, soft and loud. If a musician liked only some of them, what could he sing? He has got to know how to use all of them and blend them together. So too must we with good and ill, which are of one substance with our life. Without such blending our being cannot be: one category is no less necessary than the other.

Michel de Montaigne (1533-1592) French essayist

Essays, Book 3, Essay 13 “On Experience” (1587-88) [tr. Screech (1987)]
    (Source)

Alt. trans.

• [Frame (1943)] "We must learn to endure what we cannot avoid. Our life is composed, like the harmony of the world, of contrary things, also of different tones, sweet and harsh, sharp and flat, soft and loud. If a musician liked only one kind, what would he have to say? He must know how to use them together and blend them. And so must we do with good and evil, which are consubstantial with our life. Our existence is impossible without this mixture, and one element is no less necessary for it than the other."
• [Source] "We must learn to suffer what we cannot evade; our life, like the harmony of the world, is composed of contrary things -- of diverse tones, sweet and harsh, sharp and flat, sprightly and solemn: the musician who should only affect some of these, what would he be able to do? He must know how to make use of them all, and to mix them; and so we should mingle the goods and evils which are consubstantial with our life; our being cannot subsist without this mixture, and the one part is no less necessary to it than the other."
• [Florio (1603)] A man must learne to endure that patiently which he cannot avoyde conveniently. Our life is composed, as is the harmony of the world, of contrary things: so of divers tunes, some pleasant, some harsh, some sharpe, some flat, some low, and some high. What would that musitian say that should love but some one of them? He ought to know how to use them severally and how to entermingle them. So should we both of goods and evils which art consubstnatiall to our life; our being cannot subsist without this commixture, whereto one side is no lesse necessary than the other."