To be master of any branch of knowledge, you must master those which lie next to it, and thus to know anything you must know all.

Science ... in other words, knowledge-is not the enemy of religion; for, if so, then religion would mean ignorance. But it is often the antagonist of school-divinity.

The nearer you come into relation with a person, the more necessary do tact and courtesy become.

Eloquence may set fire to reason.

Knowledge-it excites prejudices to call it science-is advancing as irresistibly, as majestically, as remorselessly as the ocean moves in upon the shore.

Even the wisest woman you talk to is ignorant of something you may know, but an elegant woman never forgets her elegance.

Every idea is an incitement. It offers itself for belief, and if believed it is acted on unless some other belief outweighs it or some failure of energy stifles the movement at its birth. The only difference between the expression of an opinion and an incitement is the speaker's enthusiasm for the result.