« [T]he Schoolmen ... aiming at glory and esteem, ... found this a good expedient to cover their ignorance, with a curious and inexplicable web of perplexed words, and [to] procure to themselves the admiration of others, by unintelligible terms ...: whilst it appears in all history, that these profound doctors ... brought but small advantage to human life, or the societies, wherein they lived; unless the coining of new words, where they produced no new things to apply them to, or the perplexing or obscuring the signification of old ones, and so bringing all things into question and dispute, were a thing profitable to the life of man, or worthy of commendation and reward.
... Nevertheless, this artificial ignorance, and learned gibberish, prevailed mightily in these last ages, by the interest and artifice of those, who found no easier way to that pitch of authority and dominion they have attained, than by ... employing the ingenious and idle in intricate disputes, about unintelligible terms, and holding them perpetually entangled in that endless labyrinth.
Besides, the best way to defend strange and absurd doctrines is to guard them with legions of obscure, doubtful, and undefined words. Yet that makes these retreats more like dens of robbers or holes of foxes than like fortresses manned by sturdy warriors, [as] what makes it hard to get them out of their retreat isn’t their strength but rather the dark tangle of briars and thorns they are surrounded with. Because untruth is unacceptable to the mind of man, the only defence left for absurdity is obscurity.
... [T]hough unlearned men well enough understood the words white and black, etc. and had constant notions of the ideas signified by those words; yet there were philosophers found, who had learning and subtlety enough to prove, that snow was black; i.e. to prove, that white was black. Whereby they had the advantage to destroy the instruments and means of discourse, conversation, instruction, and society; whilst with great art and subtlety they did no more but perplex and confound the signification of words, and thereby render language less useful ... »
— John Locke, An Essay Concerning Human Understanding (1690)