There is nothing more frightful than for a teacher to know only what his scholars are intended to know.

The assault of our enemies is not part of our life; it is only part of our experience; we throw it off and guard ourselves against it as against frost, storm, rain, hail, or any other of the external evils which may be expected to happen.

Fools and wise men are equally harmless. It is the half-fools and half-wise that are dangerous.

We don't get to know people when they come to us; we must go to them to find out what they are like.

One glance, one word from you gives more pleasure than all the wisdom of this world.

Someday someone will write a pathology of experimental physics and bring to light all those swindles which subvert our reason, beguile our judgement and, what is worse, stand in the way of any practical progress. The phenomena must be freed once and for all from their grim torture chamber of empiricism, mechanism, and dogmatism; they must be brought before the jury of man's common sense.

The nude is the perfect expression of freedom. Freedom to be.