In ordinary speech the words perception and sensation tend to be used interchangeably, but the psychologist distinguishes. Sensations are the items of consciousness--a color, a weight, a texture--that we tend to think of as simple and single. Perceptions are complex affairs that embrace sensation together with other, associated or revived contents of the mind, including emotions.

An artist has every right - one may even say a duty - to exhibit his productions as prominently as he can.

The sole justification of teaching, of the school itself, is that the student comes out of it able to do something he could not do before. I say do and not know, because knowledge that doesn't lead to doing something new or doing something better is not knowledge at all.

no subject of study is more important than reading…all other intellectual powers depend on it.

Life is given us as a passion.

Above all, do not talk yourself out of good ideas by trying to expound them at haphazard meetings.

Boredom and fatigue are great historical forces.