In scientific work, those who refuse to go beyond fact rarely get as far as fact.

The vast results obtained by Science are won by no mystical faculties, by no mental processes other than those which are practicedby every one of us, in the humblest and meanest affairs of life. A detective policeman discovers a burglar from the marks made by his shoe, by a mental process identical with that by which Cuvier restored the extinct animals of Montmartre from fragments of their bones.

No one can help another very much in these crises of life; but love and sympathy count for something.

The rung of a ladder was never meant to rest upon, but only to hold a man's foot long enough to enable him to put the other somewhat higher.

Genius as an explosive power beats gunpowder hollow; and if knowledge, which should give that power guidance, is wanting, the chances are not small that the rocket will simply run amuck among friends and foes.

That man, I think, has had a liberal education, who has been so trained in youth that his body is the ready servant of his will.

Only one absolute certainty is possible to man, namely that at any given moment the feeling which he has exists.