John Locke; On True and False Ideas 1690
Channel: Age of Enlightenment
Date: 2015-11-01

John Locke's Essay Concerning Human Understanding, Chapter 32: Of True and False Ideas 1690
Here's the text of the whole book.
http://enlightenment.supersaturated.com/johnlocke/longcontents.html

And a quote from his preface.

The commonwealth of learning is not at this time without master-builders, whose mighty designs, in advancing the sciences, will leave lasting monuments to the admiration of posterity: but every one must not hope to be a Boyle or a Sydenham; and in an age that produces such masters as the great Huygenius and the incomparable Mr. Newton, with some others of that strain, it is ambition enough to be employed as an under-labourer in clearing the ground a little, and removing some of the rubbish that lies in the way to knowledge;- which certainly had been very much more advanced in the world, if the endeavours of ingenious and industrious men had not been much cumbered with the learned but frivolous use of uncouth, affected, or unintelligible terms, introduced into the sciences, and there made an art of, to that degree that Philosophy, which is nothing but the true knowledge of things, was thought unfit or incapable to be brought into well-bred company and polite conversation. From his Preface