In matters of intellect, follow your reason as far as it will take you, without regard for any other consideration.

Deduction, which takes us from the general proposition to facts again-teaches us, if I may so say, to anticipate from the ticket what is inside the bundle.

The great tragedy of science - the slaying of a beautiful hypothesis by an ugly fact.

Friendship involves many things but, above all the power of going outside oneself and appreciating what is noble and loving in another.

God give me strength to face a fact though it slay me.

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.

If then, said I, the question is put to me would I rather have a miserable ape for a grandfather or a man highly endowed by nature and possessing great means and influence and yet who employs those faculties for the mere purpose of introducing ridicule into a grave scientific discussion-I unhesitatingly affirm my preference for the ape.