Stereotypes are folk statistics.
Operations of thought are like cavalry charges in a battle — they are strictly limited in number, require fresh horses, and must only be made at decisive moments.
The conclusions of philosophy are both true and interesting; but what is true is not interesting, and what is interesting is not true.
Any discipline that aspires to predict the future must first predict the past.
They laughed at Edison, they laughed at Fulton, and they laughed at every hopeless crackpot.
Read a lot: think some: write a little.
The cliché is not the hackneyed phrase, but the hackneyed train of thought of which it is the natural product.
Certain ideas are so corrosive that they eat through even themselves.
The parable of the drunk looking for his keys under the street lamp, where the light is better, explains vast swaths of intellectual history.
The modern mind will countenance any explanation for what you say except that you believe it.
First you do not write what you think, then you do not say what you think, and finally you do not think what you think.