"This is an empty fancy, yet it is prevalent among most men.

Thus, whenever you trace back a statement and attribute it to a speaker of whom they have a good opinion, they accept it, even thought it be false; but whenever you attribute it to someone of whom they have a bad opinion, they reject it. even though it be true. This they always know the truth by men, not men by the truth--which is the ne plus ultra of error!"

-Al-Ghazālī, Deliverer from Error, p. 40.