“There is a virtue, Simmias, which is named courage. Is not that a special attribute of the philosopher? …Again, there is temperance. Is not the calm, and control, and disdain of the passions which even the many call temperance, a quality belonging only to those who despise the body and live in philosophy?”
Plato, Phaedo
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Socrates 168
classical Greek Athenian philosopher -470–-399 BCRelated quotes

Of Adversity
Essays (1625)
Context: The virtue of prosperity, is temperance; the virtue of adversity, is fortitude; which in morals is the more heroical virtue. Prosperity is the blessing of the Old Testament; adversity is the blessing of the New; which carrieth the greater benediction, and the clearer revelation of God's favor. Yet even in the Old Testament, if you listen to David's harp, you shall hear as many hearse-like airs as carols; and the pencil of the Holy Ghost hath labored more in describing the afflictions of Job, than the felicities of Solomon. Prosperity is not without many fears and distastes; and adversity is not without comforts and hopes.

From Vérité: forçage et innomable, translated as Truth: Forcing and the Unnameable in Theoretical Writings. London: Continuum, 2004. ISBN 0826461468.

“He resolved not to speak again until he had controlled his temper.”
Source: Earthsea Books, The Farthest Shore (1972), Chapter 3, "Hort Town"