We can know only that we know nothing. And that is the highest degree of human wisdom.

The possibility of killing one's self is a safety valve. Having it, man has no right to say life is unbearable.

These prin­ciples laid down as in variable rules: that one must pay a card sharper, but need not pay a tailor; that one must never tell a lie to a man, but one may to a woman; that one must never cheat any one, but one may a husband; that one must never pardon an insult, but one may give one and so on. These principles were possibly not reasonable and not good, but they were of unfailing certainty, and so long as he adhered to them, Vronsky felt that his heart was at peace and he could hold his head up.

There is no significant idea which cannot be explained to an intelligent twelve year old boy in fifteen minutes.

The antagonism between life and conscience may be removed in two ways: by a change of life or by a change of conscience.

I sit on a man's back, choking him and making him carry me, and yet assure myself and others that I am very sorry for him and wish to ease his lot by all possible means - except by getting off his back.

One must do one of two tings: either admit that the existing order of society is just, and then stick up for one's rights in it;or acknowledge that you are enjoying unjust privileges, as i do, and then enjoy them and be satisfied.