In great cities men are brought together by the desire of gain. They are not in a state of co-operation, but of isolation, as to the making of fortunes; and for all the rest they are careless of neighbors.

A new acquaintance is like a new book. I prefer it, even if bad, to a classic.

Doubt is an element of criticism, and the tendency of criticism is necessarily skeptical.

Scientific, like spiritual truth, has ever from the beginning been descending from heaven to man.

In politics experiments means revolutions.

Never complain and never explain.

Man is more powerful than matter.