“Mathematics is the queen of disciplines.... it will drive the nonsense out of your head!”

“Those whom God wishes to destroy he drives mad.”

“Quos vilt perdere dementat' Whome the gods wish to destroy, they first drive mad (Latin).”

“He [Vronsky] himself felt that, except that crazy fellow married to Kitty Shcherbatsky, who, quite irrelevantly had with rabid virulence told him a lot of pointless nonsense, every nobleman whose acquaintance he had made had become his partisan.”

“It was as if the main screw in his head, which held his whole life together, had become stripped. The screw would not go in, would not come out, but turned in the same groove without catching hold, and it was impossible to stop turning it.”

“When one's head is gone one doesn't weep over one's hair!”

“I think... if it is true that there are as many minds as there are heads, then there are as many kinds of love as there are hearts.”