Social progress takes effect through the replacement of all institutions by new ones; and since every institution involves the recognition of the duty of conforming to it, progress must involve the repudiation of an established duty at every step.

I really don't think I could consent to go to Heaven if I thought there were no animals there.

I never thought much of the courage of a lion tamer. Inside the cage he is at least safe from people.

Every Englishman believes that Handel now occupies an important position in heaven. If so, le bon Dieu must feel toward him very much as Louis Treize felt toward Richelieu.

Few of us have vitality enough to make any of our instincts imperious.

Vivisection is a social evil because if it advances human knowledge, it does so at the expense of human character.

There are no secrets better kept than the secrets everybody guesses.