The history of creation is but a succession of battles between amateurs of genius-inspired heretics- and orthodox professionals.

I have always been - I think any student of history almost inevitably is - a cheerful pessimist.

For the educated, the authority of science rested on the strictness of its methods; for the mass, it rested on the powers of explanation.

In teaching you cannot see the fruit of a day's work. It is invisible and remains so, maybe for twenty years.

Democracy, to maintain itself, must repeatedly conquer every cell and corner of the nation. How many of our public institutions and private businesses, our schools, hospitals, and domestic hearths are in reality little fascist states where freedom of speech is more rigorously excluded than vermin?

In any assembly the simplest way to stop transacting business and split the ranks is to appeal to a principle.

Art distills sensation and embodies it with enhanced meaning in a memorable form - or else it is not art.