Full Idea
Leibniz objected to Descartes' theory of truth, saying that people may think something is clear and distinct, and yet be wrong.
Gist of Idea
Someone may think a thing is 'clear and distinct', but be wrong
Source
comment on René Descartes (Meditations [1641], §3.36) by Gottfried Leibniz - works
Book Reference
Cottingham,John: 'The Rationalists' [OUP 1988], p.49
A Reaction
Quite so. Descartes has misunderstood what sort of concept 'truth' is meant to be. It's the usual confusion of epistemology and metaphysics. Truth is not a feature of the human mind.