You cannot have power for good without having power for evil too. Even mother's milk nourishes murderers as well as heroes.
(George Bernard Shaw (1856-1950), Anglo-Irish playwright, critic. (First produced 1905). Cusins, in Major Barbara, act 3, The Bodley Head Bernard Shaw: Collected Plays with their Prefaces, vol. 3, ed. Dan H. Laurence (1971).)
The ordinary man is as courageous and invulnerable as a hero when he does not recognize any danger, when he has no eyes to see it. Conversely, the hero's only vulnerable spot is on his back, and so exactly where he has no eyes.
(Friedrich Nietzsche (1844-1900), German philosopher, classical scholar, critic of culture. Friedrich Nietzsche, Sämtliche Werke: Kritische Studienausgabe, vol. 2, p. 334, eds. Giorgio Colli and Mazzino Montinari, Berlin, de Gruyter (1980). Human, All-Too-Human, "Man Alone With Himself," aphorism 572, "The Origin of Courage," (1878).)