I learned many years ago never to waste time trying to convince my colleagues.

The real difficulty, the difficulty which has baffled the sages of all times, is rather this: how can we make our teaching so potent in the motional life of man, that its influence should withstand the pressure of the elemental psychic forces in the individual?

Student: Dr. Einstein, Aren't these the same questions as last year's [physics] final exam? Dr. Einstein: Yes; But this year the answers are different.

It followed from the special theory of relativity that mass and energy are both but different manifestations of the same thing...

Time is an illusion.

The more one chases the quanta, the better they hide themselves.

I do not believe in a personal God and I have never denied this but have expressed it clearly.