Certain ideas are so corrosive that they eat through even themselves.
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 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.
If you must be stupid, at least be lazy.
It is rarer to know when to think than how.
The deontologist blindfolds himself, lest his eyes deceive him.
Philosophers are careful not to derive ought from is, less so about deriving is from ought.
Polytheism is pre-scientific: monotheism is anti-scientific.
What is not indexed may as well not exist.