For what a man had rather were true he more readily believes. Therefore he rejects difficult things from impatience of research; sober things, because they narrow hope; the deeper things of nature, from superstition; the light of experience, from arrogance and pride, lest his mind should seem to be occupied with things mean and transitory; things not commonly believed, out of deference to the opinion of the vulgar. Numberless, in short, are the ways, and sometimes imperceptible, in which the affections color and infect the understanding.

Francis Bacon (1561-1626) English philosopher, scientist, author, statesman
Novum Organum, Book 1, Aphorism 49 (1620)

Alt. trans.: "Man prefers to believe what he prefers to be true." [Quod enim mavult homo verum esse, id potius credit.] See Demosthenes.