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

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

Everything must be made as simple as possible. But not simpler.

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

Something deeply hidden had to be behind things.