“Each voice carries a portion of value, no matter how unpalatable or distasteful that voice may be: no one person, government, ideology, transnational, or religious institution can own and dominate the whole.”

“Ownership is not limited to material things. It can also apply to points of view. Once we take ownership of an idea — whether it’s about politics or sports — what do we do? We love it perhaps more than we should. We prize it more than it is worth. And most frequently, we have trouble letting go of it because we can’t stand the idea of its loss. What are we left with then? An ideology — rigid and unyielding.”

“Whenever I think of something but can’t think of what it was I was thinking of, I can’t stop thinking until I think I’m thinking of it again. I think I think too much.”

“I can’t understand why people are frightened of new ideas. I’m frightened of the old ones.”

“A man may die, nations may rise and fall, but an idea lives on. Ideas have endurance without death.”

“On no subject are our ideas more warped and pitiable than on death. … Let children walk with nature, let them see the beautiful blendings and communions of death and life, their joyous inseparable unity, as taught in woods and meadows, plains and mountains and streams of our blessed star, and they will learn that death is stingless indeed, and as beautiful as life, and that the grave has no victory, for it never fights.”

“I like the scientific spirit—the holding off, the being sure but not too sure, the willingness to surrender ideas when the evidence is against them: this is ultimately fine—it always keeps the way beyond open—always gives life, thought, affection, the whole man, a chance to try over again after a mistake—after a wrong guess.”