Full Idea
Amongst all the ideas we have… there is none more simple, than that of unity, or one… every idea in our understanding, every thought in our minds, brings this idea along with it.
Gist of Idea
Every simple idea we ever have brings the idea of unity along with it
Source
John Locke (Essay Conc Human Understanding (2nd Ed) [1694], 2.16.01)
Book Reference
Locke,John: 'Essay Concerning Human Understanding', ed/tr. Nidditch,P.H. [OUP 1979], p.205
A Reaction
If every idea we think of necessarily brings another idea along with it, that makes you suspect that the accompanying idea is innate. If I derive the concept of the sun from experience, do I also derive the idea that my concept is a unity?