Full Idea
There are no things so remote, nor so contrary, which the mind cannot, by its art of composition, bring into one idea, as is visible in that signified by the name 'Universe'.
Gist of Idea
The mind can make a unity out of anything, no matter how diverse
Source
John Locke (Essay Conc Human Understanding (2nd Ed) [1694], 2.24.03)
Book Reference
Locke,John: 'Essay Concerning Human Understanding', ed/tr. Nidditch,P.H. [OUP 1979], p.318
A Reaction
This encourages ideas like unrestricted mereological composition, and the existence of the trout-turkey, but Locke is only saying that we can think of things that way. We can still strongly resist bizarre unities, and look only for natural ones, or none.