Education is the instruction of the intellect in the laws of Nature.

The most considerable difference I note among men is not in their readiness to fall into error, but in their readiness to acknowledge these inevitable lapses.

There is no sadder sight in the world than to see a beautiful theory killed by a brutal fact.

Veracity is the heart of morality.

All truth, in the long run, is only common sense clarified.

You may read any quantity of books, and you may almost as ignorant as you were at starting, if you don't have, at the back of yourminds, the change for words in definite images which can only be acquired through the operation of your observing faculties on the phenomena of nature.

Nothing can be more incorrect than the assumption one sometimes meets with, that physics has one method, chemistry another, and biology a third.