Full Idea
What comes not within the scrutiny of the human senses ...can appear more or less probable only as they more or less agree to truths that are established in the our minds, and as they hold proportion to other parts of our knowledge and observation.
Gist of Idea
Facts beyond immediate experience are assessed by agreement with known truths and observations
Source
John Locke (Essay Conc Human Understanding (2nd Ed) [1694], 4.16.12)
Book Reference
Locke,John: 'Essay Concerning Human Understanding', ed/tr. Nidditch,P.H. [OUP 1979], p.665
A Reaction
This remark strikes me as an excellent attempt to get at what we mean by coherence in justification. It is also, note, a good account of what we would count as a best explanation.