Book 12
5
"But why is a Stoic philosopher, upon whom they say no compulsion can be exerted, compelled to utter groans against his will? It is true that no compulsion can be exerted upon a wise man when he has the opportunity of using his reason; but when nature compels, then reason also, the gift of nature, is compelled. Inquire also, if you please, why a man involuntarily winks when someone's hand is suddenly directed against his eyes, why when the sky is lit up by a flash of lightning he involuntarily drops his head and closes his eyes, why as the thunder grows louder he gradually becomes terrified, why he is shaken by sneezing, why he sweats in the heat of the sun or grows cold amid severe frosts. For these and many other things are not under the control of the will, the judgment, or the reason, but are decrees of nature and of necessity.
5
Moreover, that is not fortitude which, like a giant, struggles against nature and goes beyond her bounds, either through insensibility of spirit, or savage pride, or some unhappy and compulsory practice in bearing pain—such as we heard of in a certain savage gladiator of Caesar's school, who used to laugh when his wounds were probed by the doctors—but that is true and noble fortitude which our forefathers called a knowledge of what is endurable and unendurable. From this it is evident that there are some insupportable trials, from the undergoing or endurance of which brave men may shrink.
