Full Idea
What usually misleads us is that we very frequently form a judgement although we do not have an accurate perception of what we judge.
Gist of Idea
Most errors of judgement result from an inaccurate perception of the facts
Source
René Descartes (Principles of Philosophy [1646], I.33)
Book Reference
Descartes,René: 'Philosophical Essays and Correspondence', ed/tr. Ariew,Roger [Hackett 2000], p.239
A Reaction
This seems to me a generally accurate observation, particularly in the making of moral judgements (which was probably not what Descartes was considering). The implication is that judgements are to a large extent forced by our perceptions.