Each truth that a writer acquires is a lantern, which he turns full on what facts and thoughts lay already in his mind, and behold, all the mats and rubbish which had littered his garret become precious. Every trivial fact in his private biography becomes an illustration of this new principle, revisits the day, and delights all men by its piquancy and new charm.

Nature tells every secret once.

Men love to wonder, and that is the seed of our science, and such is the mechanical determination of our age, and so recent are our best contrivances, that use has not dulled our joy and pride in them. These arts open great gates of a future, promising to make the world plastic and to lift human life out of its beggary to a godlike ease and power.

You cannot kindle a fire in any other heart until it is burning in your own.

I count him a great man who inhabits a higher sphere of thought, into which other men rise with labor and difficulty; he has but to open his eyes to see things in a true light, and in large relations; whilst they must make painful corrections, and keep a vigilant eye on many sources of error.

There is no good theory of disease which does not at once suggest a cure.

I see not any road of perfect peace which a man can walk but after the counsel of his own bosom.