“But the capacity to enjoy is impossible without the capacity to suffer; and the faculty of enjoyment is one with that of pain. Whosoever does not suffer does not enjoy, just as whosoever is insensible to cold is insensible to heat.”
The Tragic Sense of Life (1913), VII : Love, Suffering, Pity
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Miguel de Unamuno 199
19th-20th century Spanish writer and philosopher 1864–1936Related quotes

“If 4 out of 5 people SUFFER from diarrhea…does that mean that 1 enjoys it?”

Widely attributed since the mid to late 19th century, this apparently derives from a gloss or commentary on the following passage from Aristotle's Nicomachean Ethics (c. 325 BC), Book 1, Ch. XI (Bekker No. 1100b.13–14):
ὅμως δὲ καὶ ἐν τούτοις διαλάμπει τὸ καλόν, ἐπειδὰν φέρῃ τις εὐκόλως πολλὰς καὶ μεγάλας ἀτυχίας, μὴ δι᾽ ἀναλγησίαν, ἀλλὰ γεννάδας ὢν καὶ μεγαλόψυχος. εἰ δ᾽ εἰσὶν αἱ ἐνέργειαι κύριαι τῆς ζωῆς, καθάπερ εἴπομεν, οὐδεὶς ἂν γένοιτο τῶν μακαρίων ἄθλιος
But nevertheless, even in these [misfortunes], nobility of the soul is conspicuous, when a man bears and digests many and great misfortunes, not from insensibility, but because he is high spirited and magnanimous. But if the energies are the things that constitute the bliss or the misery of life, as we said, no happy man can ever become miserable.
A New Translation of the Nicomachean Ethics of Aristotle (1835), 3rd. ed., Oxford: J. Vincent. p. 30
Nevertheless even under these [misfortunes] the force of nobility shines out, when a man bears calmly many great disasters, not from insensibility, but because he is generous and of a great soul. Setting happiness then, as we do, not in the outward surroundings of man, but in his inward state, we may fairly say that no one who has attained to the bliss of virtue will ever justly become an object of pity or contempt.
St. George William Joseph Stock, Lectures in the Lyceum or Aristotle's ethics for English readers (1897), p. 47
Misattributed

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 45.

“One suffers work, even if one enjoys doing it.”
P 34
Women As Lovers (1994)

Source: Don Quixote de la Mancha (1605–1615), Part II (1615), Book III, Ch. 6.

Source: The Notebooks of Leonardo Da Vinci (1938), I Philosophy, p. 91
Context: He who suffers time to slip away and does not grow in virtue the more one thinks about him the sadder one becomes. No man has a capacity for virtue who sacrifices honour for gain. Fortune is powerless to help one who does not exert himself. That man becomes happy who follows Christ. There is no perfect gift without great suffering. Our triumphs and our pomps pass away; gluttony and sloth and enervating luxury have banished every virtue from the world; so that as it were wandering from its course our nature is subdued by habit. Now and henceforth it is meet that you cure yourself of laziness. The Master has said that sitting on down or lying under the quilts will not bring thee to fame. He who without it has frittered life away leaves no more trace of himself upon the earth than smoke does in the air or the foam on the water.

...in der ganzen Natur, mit dem Grad der Intelligenz die Fähigkeit zum Schmerze sich steigert, also ebenfalls erst hier ihre höchste Stufe erreicht.
The Wisdom of Life. Chapter II. Personality, or What a Man Is: Footnote 19
Parerga and Paralipomena (1851), Not yet placed by volume, chapter or section