In the physical world, one cannot increase the size or quantity of anything without changing its quality. Similar figures exist only in pure geometry.

Talent without genius isn't much, but genius without talent is nothing whatsoever.

A poem is never finished, only abandoned.

What Degas called 'a way of seeing' must consequently bear a wide enough interpretation to include way of being, power, knowledge, and will.

Every man expects some miracle — either from his mind or from his body or from someone else or from events.

The only truths which are universal are those gross enough to be thought so.

Science is a collection of successful recipes.