"If numbers aren't beautiful, I don't know what is."

“I'm not competent to judge. But no doubt he was a great man.”

“We'll continue tomorrow — if I live.”

“Searchable collection of all papers of Erdős”

“Some French socialist said that private property was theft … I say that private property is a nuisance.”

“This one's from the Book!”

“Suppose aliens invade the earth and threaten to obliterate it in a year's time unless human beings can find the Ramsey number for red five and blue five. We could marshal the world's best minds and fastest computers, and within a year we could probably calculate the value. If the aliens demanded the Ramsey number for red six and blue six, however, we would have no choice but to launch a preemptive attack.”