The vague torment of ... ambition.

If you ask me what I came into this life to do, I will tell you: I came to live out loud.

Man's highest duty is to protect animals from cruelty.

Nothing develops intelligence like travel.

Truth is on the march, and nothing will stop it.

The fate of animals is of greater importance to me than the fear of appearing ridiculous; it is indissolubly connected with the fate of men.

Did science promise happiness? I do not believe it. It promised truth, and the question is to know if we will ever make happiness with truth.

Governments are suspicious of literature because it is a force that eludes them.

If you shut up truth, and bury it underground, it will but grow.

The only basis for living is believing in life, loving it, and applying the whole force of one's intellect to know it better.

Respectable people... What bastards!

Perhaps no one has yet been truthful enough about what 'truthfulness' is.

It (proof by contradiction) is a far finer gambit than any chess gambit: a chess player may offer the sacrifice of a pawn or even a piece, but a mathematician offers the game.

Education may work wonders as well in warping the genius of individuals as in seconding it.

I found out that it's not good to talk about my troubles. Eighty percent of the people who hear them don't care and the other twenty percent are glad you're having them.

Fallout shelters are like bell-bottoms. They've gone in and out of favor.

They’d already taken her from me once. I didn’t want to lose her again.

Every one must be familiar with the often expressed opinion, that, as a practical politician, Mr. Mill's career was essentially a failure.

Leadership is defined by results not attributes.

Paperwork is the embalming fluid of bureaucracy, maintaining an appearance of life where none exists.

The social and economic impact of innovative American researchers, companies, and workers over the course of U.S. history have been enormous.