To comprehend an idea, a person must simultaneously accept it as true. Conscious analysis - which, depending on the idea, may occur almost immediately or with considerable effort - allows the mind to reject what it intially accepted as fact.
Baruch SpinozaI saw that all things I feared, and which feared me, had nothing good or bad in them save insofar as the mind was affected by them.
Baruch SpinozaHe who has a true idea, knows at that same time that he has a true idea, nor can he doubt concerning the truth of the thing.
Baruch Spinoza