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Science is facts; just as houses are made of stones, so is science made of facts; but a pile of stones is not a house and a collection of facts is not necessarily science.

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What the world needs is not dogma but an attitude of scientific inquiry combined with a belief that the torture of millions is not desirable, whether inflicted by Stalin or by a Deity imagined in the likeness of the believer.

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All changes, even the most longed for, have their melancholy; for what we leave behind us is a part of ourselves; we must die to one life before we can enter another.

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No matter how much the cats fight, there always seem to be plenty of kittens.

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Science may set limits to knowledge, but should not set limits to imagination.

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Every person takes the limits of their own field of vision for the limits of the world.

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We are just an advanced breed of monkeys on a minor planet of a very average star. But we can understand the Universe. That makes us something very special.

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You wake me up early in the morning to tell me I am right? Please wait until I am wrong.

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Kindness and compassion toward all living things is a mark of a civilized society. Conversely, cruelty, whether it is directed against human beings or against animals, is not the exclusive province of any one culture or community of people. Racism, economic deprival, dog fighting and cock fighting, bull fighting and rodeos are cut from the same fabric: violence. Only when we have become nonviolent toward all life will we have learned to live well ourselves.

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People often say that humans have always eaten animals, as if this is a justification for continuing the practice. According to this logic, we should not try to prevent people from murdering other people, since this has also been done since the earliest of times.

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