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When two men of science disagree, they do not invoke the secular arm; they wait for further evidence to decide the issue, because, as men of science, ...more

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The belief that personality is mysterious and irreducible has no scientific warrant, and is accepted chiefly because it is flattering to our human sel...more

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Change is scientific, ‘progress’ is ethical. Change is indubitable whereas progress is a matter of controversy.

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The world is full of magical things patiently waiting for our wits to grow sharper.

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We know very little, and yet it is astonishing that we know so much, and still more astonishing that so little knowledge can give us so much power.

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All who are not lunatics are agreed about certain things. That it is better to be alive than dead, better to be adequately fed than starved, better to...more

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Science is what you know, philosophy is what you don't know

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Science tells us what we can know, but what we can know is little, and if we forget how much we cannot know we become insensitive to many things of ve...more

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It is not what the man of science believes that distinguishes him, but how and why he believes it. His beliefs are tentative, not dogmatic; they are b...more

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William James describes a man who got the experience from laughing-gas; whenever he was under its influence, he knew the secret of the universe, but w...more

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What Galileo and Newton were to the seventeenth century, Darwin was to the nineteenth.

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Almost everything that distinguishes the modern world from earlier centuries is attibutable to science, which achieved its most spectacular triumphs i...more

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I have been accused of a habit of changing my opinions. I am not myself in any degree ashamed of having changed my opinions. What physicist who was al...more

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Aristotle maintained that women have fewer teeth than men; although he was twice married, it never occurred to him to verify this statement by examini...more