A man's ethical behavior should be based effectually on sympathy, education, and social ties; no religious basis is necessary. Man would indeed be in a poor way if he had to be restrained by fear of punishment and hope of reward after death.

Once you can accept the universe as being something expanding into an infinite nothing which is something, wearing stripes with plaid is easy.

There is a principle that is a bar against all information and proof against all arguments, which cannot fail to keep a man in everlasting ignorance.  That principle is contempt prior to investigation.

Pigs and cows and chickens and people are all competing for grain.

There is a spirit and a need and a man at the beginning of every great human advance. Every one of these must be right for that particular moment of history, or nothing happens.

Almost always, the creative dedicated minority has made the world better.

Although the world is full of suffering, it is full also of the overcoming of it.

I long to accomplish a great and noble task, but it is my chief duty to accomplish humble tasks as though they were great and noble.