The physicist's greatest tool is his wastebasket.
I am a deeply religious nonbeliever - this is a somewhat new kind of religion.
The important thing is to never stop questioning. Never lose a holy curiosity.
Few people are capable of expressing with equanimity opinions which differ from the prejudices of their social environment. Most people are even incapable of forming such opinions.
The creative principle [of science] resides in mathematics.
Learn from yesterday, live for today.