Thoughts, like old vultures, prey upon their heart-strings

No science is speedily learned by the noblest genius without tuition.

Do not hover always on the surface of things, nor take up suddenly with mere appearances; but penetrate into the depth of matters, as far as your time and circumstances allow, especially in those things which relate to your profession.

The eyes of a man in the jaundice make yellow observations on everything; and the soul tinctured with any passion diffuses a false color over the appearance of things.

I have been there, and still would go; 'T is like a little heaven below.

Though reading and conversation may furnish us with many ideas of men and things, yet it is our own meditation must form our judgment.

Do not expect to arrive at certainty in every subject which you pursue. There are a hundred things wherein we mortals. . . must be content with probability, where our best light and reasoning will reach no farther.