Gratitude is a debt which usually goes on accumulating like blackmail; the more you pay, the more is exacted.

I should be sorry to think it was the publishers themselves they got up this entire little flutter to enable them to unload a book that was taking too much room in their cellars, but you can never tell what a publisher will do. I have been one myself.

I am not interested to know whether vivisection produces results that are profitable to the human race or doesn't...The pain which it inflicts upon unconsenting animals is the basis of my enmity toward it, and it is to me sufficient justification of the enmity without looking further.

...heaven for climate, and hell for society.

A brown spotted lady-bug climbed the dizzy height of a grass blade, and Tom bent down close to it and said, "Lady-bug, lady-bug, fly away home, your house is on fire, your children's alone," and she took wing and went off to see about it -- which did not surprise the boy, for he knew of old that this insect was credulous about conflagrations, and he had practised upon its simplicity more than once.

Always acknowledge a fault. This will throw those in authority off their guard and give you an opportunity to commit more.

The water is clearer than the air, and the air is the air that angels breathe.