Genius does what it must, talent does what it can."

"A fresh mind keeps the body fresh. Take in the ideas of the day, drain off those of yesterday. As to the morrow, time enough to consider it when it becomes today."

"Chance happens to all, but to turn chance to account is the gift of few."

"The true spirit of conversation consists in building on another man's observation, not overturning it."

"In science, address the few, in literature, the many. In science, the few must dictate opinion to the many; in literature, the many, sooner or later, force their judgment on the few."