Full Idea
He that believes, without having any reason for believing, may be in love with his own fancies.
Gist of Idea
Believing without a reason may just be love of your own fantasies
Source
John Locke (Essay Conc Human Understanding (2nd Ed) [1694], 4.17.24)
Book Reference
Locke,John: 'Essay Concerning Human Understanding', ed/tr. Nidditch,P.H. [OUP 1979], p.687
A Reaction
This comes close to Clifford's Principle, though he demands 'evidence', rather than a reason. Of course, the supposed 'reason' may be just as much of a fantasy as the belief!
Related Idea
Idea 6587 It is always wrong to believe things on insufficient evidence [Clifford]