The next world war will be fought with stones.
Gravity is a response to geometry.
Common sense is nothing more than a deposit of prejudices laid down by the mind before you reach eighteen.
The genius is in making the complex simple.
One thing I have learned in a long life: that all our science, measured against reality, is primitive and childlike -- and yet it is the most precious thing we have.
In art, and in the higher ranges of science, there is a feeling of harmony which underlies all endeavor. There is no true greatness in art or science without that sense of harmony.