The essence of life is doing things for their own sakes.

In all the creative work that I have done, what has come first is a problem, a puzzle involving discomfort.

Emphatic and reiterated assertion, especially during childhood, produces in most people a belief so firm as to have a hold even over the unconscious.

Dora and I are now married, but just as happy as we were before.

All exact science is dominated by the idea of approximation.

When it was first proposed to establish laboratories at Cambridge, Todhunter, the mathematician, objected that it was unnecessary for students to see experiments performed, since the results could be vouched for by their teachers, all of them of the highest character, and many of them clergymen of the Church of England.

You could live without the opera singer, but not without the services of the baker. On this ground you might say that the baker performs a greater service; but no lover of music would agree.