Plutarch De Garrulitate 8

[8] Zeno, that he might not be compelled by the tortures of his body to betray, against his will, the secrets entrusted in his breast, bit off his tongue, and spit it in the tyrant’s face. Notorious also was the example of Leaena, and signal the reward which she had for being true to her trust and constant in her taciturnity. She was a courtesan with whom Harmodius and Aristogiton were very familiar; and for that reason they had imparted to her the great hopes which they had upon the success of the conspiracy against the tyrants, wherein they were so deeply engaged; while she on the other side, having drunk freely of the noble cup of love, had been initiated into their secrets through the God of Love; and she failed not of her vow. For the two paramours being taken and put to death after they had failed in their enterprise, she was also apprehended and put to the torture, to force out of her a discovery of the rest of the accomplices; but all the torments and extremities they could exercise upon her body could not prevail to make her discover so much as one person; whereby she manifested to the world that the two gentlemen, her friends, had done nothing misbecoming their descent, in having bestowed their affections upon such a woman. For this reason the Athenians, as a monument of her virtue, set up a lioness (which the name Leaena signifies) in brass, without a tongue, just at the entrance into the Acropolis; by the stomachful courage of that beast signifying to posterity the invincible resolution of the woman; and by making it without a tongue, denoting her constancy in keeping the secret with which she was entrusted. For never any word spoken did so much good, as many locked up in silence. Thus at one time or other a man may utter what heretofore has been kept a secret; but when a secret is once blurted forth, it can never be recalled; for it flies abroad, and spreads in a moment far and near. And hence it is that we have men to teach us to speak, but the Gods are they that teach us silence; silence being the first thing commanded upon our first initiation into their divine ceremonies and sacred mysteries. And therefore it is that Homer makes Ulysses, whose eloquence was so charming, to be the most silent of men; and the same virtue he also attributes to his son, to his wife, and also to his nurse. For thus you hear her speaking: And Ulysses himself, sitting by Penelope before he discovered himself, is thus brought in: So powerfully possessed with continence were both his tongue and lips; and having all the rest of his members so obedient and subject to his reason, he commanded his eye not to weep, his tongue not to speak a word, and his heart neither to pant nor tremble. his reason penetrating even to those inward motions, and subduing to itself the blood and vital spirits. Such were many of the rest of his followers. For though they were dragged and haled by Polyphemus, and had their heads dashed against the ground, they would not confess a word concerning their lord and master Ulysses, nor discover the long piece of wood that was put in the fire and prepared to put out his eye; but rather suffered themselves to be devoured raw than to disclose any one of their master’s secrets; which was an example of fidelity and reservedness not to be paralleled. Pittacus therefore did very well, who, when the king of Egypt sent him an oblation-beast, and ordered him to take out and set apart the best and worst piece of it, pulled out the tongue and sent to him, as being the instrument of many good things as well as the instrument of the greatest evils in the world.