Full Idea
A proposition is held to be true by us when our mind is ready to follow it and no reason for doubting it can be found.
Gist of Idea
We hold a proposition true if we are ready to follow it, and can't see any objections
Source
Gottfried Leibniz (Introduction to a Secret Encyclopaedia [1679], p.7)
Book Reference
Leibniz,Gottfried: 'Philosophical Writings', ed/tr. Parkinson,G.H.R. [Dent 1973], p.7
A Reaction
This follows on from Descartes' view, but it now sounds more like psychology than metaphysics. Clearly a false proposition could fit this desciption. Personally I follow propositions to which I can see no objection, without actually holding them true.