Full Idea
If the capacity of knowing be the natural Impression contended for, all the Truths a man ever comes to know, will, by this Account, be, every one of them, innate.
Gist of Idea
If the only test of innateness is knowing, then all of our knowledge is innate
Source
John Locke (Essay Conc Human Understanding (2nd Ed) [1694], 1.02.05)
Book Reference
Locke,John: 'Essay Concerning Human Understanding', ed/tr. Nidditch,P.H. [OUP 1979], p.50
A Reaction
It seems to be a nice empiricist's question, what experience involved in thinking an idea gives a hallmark that it is innate rather than acquired? Perhaps only 'I couldn't have thought of that myself', as Descartes says of several ideas.