The wise man can change his mind; the stubborn one, never.
Physicians think they do a lot for a patient when they give his disease a name.
The possession of power inevitably spoils the free use of reason.
Reason can never prove the existence of God.
Ghost stories are always listened to and well received in private, but pitilessly disavowed in public. For my own part, ignorant as I am of the way in which the human spirit enters the world and the way in which he goes out of it, I dare not deny the truth of many such narratives.
cruelty to animals is contrary to man's duty to himself, because it deadens in him the feeling of sympathy for their sufferings, and thus a natural tendency that is very useful to morality in relation to other human beings is weakened.