Something deeply hidden had to be behind things.

Matter tells space how to curve, space tells matter how to move.

Nothing happens until something moves.

If you've never done anything wrong it's probably because you have never tried anything new.

a purely algebraic physics.

The important thing is not to stop questioning. Curiosity has its own reason for existence. One cannot help but be in awe when he contemplates the mysteries of eternity, of life, of the marvelous structure of reality. It is enough if one tries merely to comprehend a little of this mystery each day.

—"Old Man's Advice to Youth: 'Never Lose a Holy Curiosity.'" LIFE Magazine (2 May 1955) p. 64