Science is organized knowledge. Wisdom is organized life.

What we see depends mainly on what we look for.

He who knows does not speak. He who speaks does not know. Close the mouth.

By doubting we come at truth.

An independent reality in the ordinary physical sense can ... neither be ascribed to the phenomena nor to the agencies of observation.

Everything is vague to a degree you do not realize till you have tried to make it precise.

A scholar who cherishes the love of comfort is not fit to be deemed a scholar.

As a working hypothesis to explain the riddle of our existence, I propose that our universe is the most interesting of all possible universes, and our fate as human beings is to make it so.

Military justice is to justice what military music is to music.

Reason has insight only into that which it produces after a plan of its own.