"It is impossible that Men should ever truly seek, or certainly discover the Agreement or Disagreement of Ideas themselves, whilst their Thoughts flutter about, or stick only in Sounds of doubtful and uncertain significations Mathematicians abstracting their Thoughts from Names, and accustoming themselves to set before their Minds the Ideas themselves, that they would consider, and not Sounds instead of them, have avoided thereby a great part of that perplexity, puddering, and confusion, which has so much hindred Mens progress in other parts of Knowledge; who sticking in Words of undetermined and uncertain signification, were unable to distinguish True from False, Certain from Probable, Consistent from Inconsistent, in their own Opinions."
— Locke, John (1632-1704)
(IV.iii.30, pp. 280-281)
I find over 25 entries in the ESTC (1690, 1694, 1695, 1700, 1706, 1710, 1715, 1721, 1726, 1731, 1735, 1741, 1748, 1753, 1759, 1760, 1765, 1768, 1775, 1777, 1786, 1788, 1793, 1795, 1796, 1798). See also the many abridgements issued in the period.
First published as An Essay Concerning Humane Understanding. In Four Books. (London: Printed by Eliz. Holt, for Thomas Basset, at the George in Fleetstreet, near St. Dunstan's Church, 1690). <Link to EEBO><EEBO-TCP>
Searching first in a Past Masters edition based on the 12th Edition of Locke's Works and proofread against the 1959 Fraser edition. More recent searches in EEBO-TCP.
Reading John Locke's An Essay Concerning Human Understanding, ed. Peter Nidditch (Oxford, Oxford UP, 1975)--against which I have checked the text searched in Past Masters. Note, Nidditch's text is based on 4th ed. of 1700.