"There two things that are infinite, human stupidity and the universe, I don't know about the universe"
"All men are ignorant, just in different fields."
"Nothing truly valuable can be achieved except by the unselfish cooperation of many individuals."
"Strange is our situation here on earth. Each of us comes for a short visit, not knowing why, yet sometimes seeming to divine a purpose."
"The mathematician knows some things, no doubt, but not those things one usually wants to get from him."