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.

[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]

Aristotle (384-322 BC) Greek philosopher
Nicomachean Ethics [Ἠθικὰ Νικομάχεια], Book 1, ch. 11 (1.11, 1100b.13-14) (c. 325 BC) [tr. Stock (1897)]
    (Source)

In St. George William Joseph Stock, Lectures in the Lyceum or Aristotle's ethics for English readers, Lecture 6 (1897).

Often highly paraphrased: "Suffering becomes beautiful when anyone bears great calamities with cheerfulness, not through insensibility but through greatness of mind."

Alt. trans.:

• "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." [tr. Vincent (1835)]
• "Yet even in these [misfortunes] nobility shines through, when a man bears with resignation many great misfortunes, not through insensibility to pain but through nobility and greatness of soul. If activities are, as we said, what gives life its character, no happy man can become miserable." [tr. Ross (1908), Book 1, ch. 10]
• "But nevertheless true worth shines out even here, in the calm endurance of many great misfortunes, not through insensibility, but through nobility and greatness of soul. And if it is what a man does that determines the character of his life, as we said, then no happy man will become miserable." [tr. Peters (1893), Book 1, ch. 10, 13]
• "Still even in these circumstances nobility shines out, when a person bears the weight of accumulated misfortunes with calmness, not from insensibility but from innate dignity and magnanimity. But if it is the activities which determine the life, as we said, nobody who is fortunate can become miserable." [tr. Weldon (1892), Book 1, ch. 11]