There is much pleasure to be gained from useless knowledge.
A process which led from the amoebae to man appeared to the philosophers to be obviously a progress -- though whether the amoebae would agree with this opinion is not known.
Although this may seem a paradox, all exact science is dominated by the idea of approximation. When a man tells you that he knows the exact truth about anything, you are safe in inferring that he is an inexact man.
It is clear that thought is not free if the profession of certain opinions makes it impossible to earn a living.
A hallucination is a fact, not an error; what is erroneous is a judgment based upon it.
The trouble with the world is that the stupid are cocksure and the intelligent full of doubt.
If a law were passed giving six months to every writer of a first book, only the good ones would do it.
Patriots always talk of dying for their country and never of killing for their country.
In America everybody is of opinion that he has no social superiors, since all men are equal, but he does not admit that he has no social inferiors.
A sense of duty is useful in work but offensive in personal relations. People wish to be liked, not to be endured with patient resignation.
A truer image of the world, I think, is obtained by picturing things as entering into the stream of time from an eternal world outside, than from a view which regards time as the devouring tyrant of all that is.
With the introduction of agriculture mankind entered upon a long period of meanness, misery, and madness, from which they are only now being freed by the beneficent operation of the machine.
If fifty million people say a foolish thing, it is still a foolish thing.
Many people when they fall in love look for a little haven of refuge from the world, where they can be sure of being admired when they are not admirable, and praised when they are not praiseworthy.