The great aim of education is not knowledge but action.

In science the important thing is to modify and change one's ideas as science advances.

A nation's institutions and beliefs are determined by it's character.

The Republican form of government is the highest form of government: but because of this it requires the highest type of human nature, a type nowhere at present existing.

No phrase can convey the idea of surprise so vividly as opening the eyes and raising the eyebrows. A shrug of the shoulders would lose much by translation into words.

Life is not for learning nor is life for working, but learning and working are for life.

A living thing is distinguished from a dead thing by the multiplicity of the changes at any moment taking place in it.