Arthur de Gobineau, Trois ans en Asie (3 years in asia) 1859:
“There is in Persia a word of which Europeans have no idea, and of which it is difficult even to give them a translation: this word is ketmân. It means the dissimulation of one’s thoughts, the concealment of one’s opinions, the careful hiding of what one truly believes or feels.
It is not considered a shame, still less a crime; it is, on the contrary, a virtue, a duty, and a necessity, imposed on everyone by the conditions of life. To practise ketmân is not merely permitted, it is commanded.
It consists in never allowing oneself to appear as one is, but in always showing oneself otherwise; it is the art of presenting to each person the aspect that will please him most, of adopting his ideas, his tastes, his language, while inwardly remaining quite different.
This perpetual exercise of disguise is carried out with a marvellous ease, and with a kind of pleasure in tricking others, which the Persians feel very keenly. They take delight in this ingenious hypocrisy; it is a game, a triumph of subtlety, in which the winner is the one who has best succeeded in hiding the truth.”