For although my nature is such that, as long as I perceive something very clearly and distinctly, I cannot not believe that it is true, nonetheless, because my nature is also such that I cannot continuously fix the gaze of the mind on the same thing in order to perceive it clearly, and what often happens is that I remember judging something to be true, then, when I am no longer concentrating on the reasons for which I made that judgement, other reasons can be adduced that would easily (were I ignorant of God) shake me out of my opinion.