Those who are in the power of evil habits must conquer them as they can; and conquered they must be, or neither wisdom nor happiness can be attained: but those who are not yet subject to their influence may, by timely caution, preserve their freedom.

Every cold empirick, when his heart is expanded by a successful experiment, swells into a theorist.

I know not any crime so great that a man could contrive to commit as poisoning the sources of eternal truth.

It matters not how a man dies, but how he lives.

To keep your secret is wisdom; but to expect others to keep it is folly.

Whatever enlarges hope will also exalt courage.

He that teaches us anything which we knew not before is undoubtedly to be reverenced as a master.