the things which we conceive very clearly and very distinctly are always true
Idealist and positivistic position in gnoseology. The clear and distinct idea becomes the key criteria of knowledge. Then that key criteria is an idea and the manipulation of the subjective self on it is obliterated. The quasi-compulsive priority given to clarity and simplicity in Cartesian rationalism is grounded in that tight connection made by the philosophical speculation between truth and apparently obvious opinions or conceptions.