Credulity is fixed: doubting something obvious just clears space for believing something foolish.
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.
In every discipline the foundations come last; in most of them we still don’t know what they are.
The critique is usually pertinent, the positive program disastrous.
One ought to reorganize one’s opinions at least as often as one’s closets.
People should do their own thinking no more than they should do their own plumbing.
A thinker is understood best by his public detractors, who have the most to lose by misunderstanding him.
Most people, on most matters, are not, in fact, entitled to an opinion.
Common sense means you don’t know the heuristic.
It is not unusual to despise a thinker explicitly and remain completely in his thrall.
The metaphor always outlives the argument.