But once I have perceived that God exists, then because I grasped at the same time that everything else depends on him, and that he is no deceiver, and from this deduced that everything I clearly and distinctly perceive is necessarily true, then, even if I am no longer concentrating on the reasons why I judged this to be true, provided I remember that I did see it clearly and distinctly, no contrary reason can be adduced that can induce me to doubt it; and thus I have true and certain knowledge scientia of it.