Man prefers to believe what he wants to be true. He rejects what is difficult because he is too impatient to make the investigation; he rejects sensible ideas, because they limit his hopes; he rejects the deeper truths of nature because of superstition; he rejects the light of experience, because he is arrogant and fastidious, believing that the mind should not be seen to be spending its time on mean, unstable things; and he rejects anything unorthodox because of common opinion. In short, emotion marks and stains the understanding in countless ways which are sometimes impossible to perceive.

[Quod enim mavult homo verum esse, id potius credit. Rejicit itaque difficilia, ob inquirendi impatientiam; sobria, quia coarctant spem; altiora naturae, propter superstitionem; lumen experientiae, propter arrogantiam et fastum, ne videatur mens versari in vilibus et fluxis; paradoxa, propter opinionem vulgi; denique innumeris modis, iisque interdum imperceptibilibus, affectus intellectum imbuit et inficit.]

Francis Bacon (1561-1626) English philosopher, scientist, author, statesman

Instauratio Magna [The Great Instauration], Part 2 “Novum Organum [The New Organon],” Book 1, Aphorism # 49 (1620) [tr. Silverthorne (2000)]
    (Source)

See Demosthenes.

(Source (Latin)). Alternate translations:

For man always believes more readily that which he prefers. He, therefore, rejects difficulties for want of patience in investigation; sobriety, because it limits his hope; the depths of nature, from superstition; the light of experiment, from arrogance and pride, lest his mind should appear to be occupied with common and varying objects; paradoxes, from a fear of the opinion of the vulgar; in short, his feelings imbue and corrupt his understanding in innumerable and sometimes imperceptible ways.
[tr. Wood (1831)]

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 colour and infect the understanding.
[tr. Spedding (1858)]

For man more readily believes what he wishes to be true. And so it rejects difficult things, from impatience of inquiry; -- sober things, because they narrow hope; -- the deeper thigns of Nature, from superstition; -- the light of experience, from arrogance and disdain, lest the mind should seem to be occupied with worthless and changing matters; -- paradoxes, from a fear of the opinion of the vulgar: -- in short, the affections enter and corrupt the intellect in innumerable ways, and these sometimes imperceptible.
[tr. Johnson (1859)]

For a man is more likely to believe something if he would like it to be true. Therefore he rejects

• difficult things because he hasn’t the patience to research them,
• sober and prudent things because they narrow hope,
• the deeper things of nature, from superstition,
• the light that experiments can cast, from arrogance and pride (not wanting people to think his mind was occupied with trivial things),
• surprising truths, out of deference to the opinion of the vulgar.

In short, there are countless ways in which, sometimes imperceptibly, a person’s likings colour and infect his intellect.
[tr. Bennett (2017)]