The fact is you cannot be intelligent merely by choosing your opinions. The intelligent man is not the man who holds such-and-such views but the man who has sound reasons for what he believes and yet does not believe it dogmatically. And opinions held for sound reasons have less emotional unity than the opinions of dogmatists because reason is non-party, favouring now one side and now another. That is what people find so unpleasant about it.
Bertrand Russell, Mortals and Others: American Essays 1931-35
dogma, philosophy, rationality, reason