To a clear eye the smallest fact is a window through which the infinite may be seen.

It is not who is right, but what is right, that is of importance.

The secret of genius is to carry the spirit of childhood into maturity.

My belief is that no human being or society composed of human beings ever did or ever will come to much unless their conduct was governed and guided by the love of some ethical ideal.

Teach a child what is wise, that is morality. Teach him what is wise and beautiful, that is religion!

The method of scientific investigation is nothing but the expression of the necessary mode of working of the human mind.

If there is anything in the world which I do firmly believe in, it is the universal validity of the law of causation.