Nietzsche on the Prejudices of the Philosophers

What provokes one to look at all philosophers half suspiciously, half mockingly, is not that one discovers again and again how innocent they are — how often and how easily they make mistakes and go astray; in short, their childishness and childlikeness — but that they are not honest enough in their work, although they all make a lot of virtuous noise when the problem of truthfulness is touched even remotely. They all pose as if they had discovered and reached their real opinions through the self-development of a cold, pure, divinely unconcerned dialectic (as opposed to the mystics of rank, who are more honest and doltish — and talk of ‘inspiration’); while at bottom it is an assumption, a hunch, indeed a kind of ‘inspiration’ — most often a desire of the heart that has been filtered and made abstract — that they defend with reasons they have sought after the fact. They are all advocates who resent that name, and for the most part even wily spokesmen for their prejudices which they baptize ‘truths’ — and very far from having the courage of the conscience that admits this, precisely this, to itself; very far from having the good taste of the courage which also lets this be known, whether to warn an enemy or friend, or, from exuberance, to mock itself.

— Nietzsche, Beyond Good & Evil