Henri-Frédéric Amiel, The Journal Intime, entry of December 26, 1868:
If men are always more or less deceived on the subject of women, it is because they forget that they and women do not speak altogether the same language, and that words have not the same weight or the same meaning for them, especially in questions of feeling. Whether from shyness or precaution or artifice, a woman never speaks out her whole thought, and moreover what she herself knows of it is but a part of what it really is. Complete frankness seems to be impossible to her, and complete self-knowledge seems to be forbidden her. If she is a sphinx to us, it is because she is a riddle of doubtful meaning even to herself. She has no need of perfidy, for she is mystery itself. A woman is something fugitive, irrational, indeterminable, illogical, and contradictory. A great deal of forbearance ought to be shown her, and a good deal of prudence exercised with regard to her, for she may bring about innumerable evils without knowing It. Capable of all kinds of devotion, and of all kinds of treason, “monstre incompréhensible,” raised to the second power, she is at once the delight and the terror of man.