Nothing is as terrible to see as ignorance in action.
Science is the belief in the ignorance of the experts.
It often happens that the universal belief of one age of mankind — a belief from which no one was, nor without an extraordinary effort of genius and courage could at that time be free — becomes to a subsequent age so palpable an absurdity, that the only difficulty then is to imagine how such a thing can ever have appeared credible.
Wise men talk because they have something to say; fools, because they have to say something.
At any given moment there is an orthodoxy, a body of ideas which it is assumed all right-thinking people will accept without question. It is not exactly forbidden to state this or that or the other, but it is “not done” … Anyone who challenges the prevailing orthodoxy finds himself silenced with surprising effectiveness. A genuinely unfashionable opinion is almost never given a fair hearing, either in the popular press or in the highbrow periodicals.
To see what is in front of one’s nose requires a constant struggle.
Dost thou not know, my son, with how little wisdom the world is governed?
The superior man understands what is right. The inferior man understands what is popular.
It has been said the greatest volume of sheer brainpower in one place occurred when Jefferson dined alone.
Some ideas are so stupid that only intellectuals believe them.