For tho my _nature_ be _such_, that during the time of my _Clear_ and _Distinct_ Perception, I cannot but believe it _true_; yet my _Nature_ is _such_ also, that I cannot fix the _Intention_ of my _Mind_ upon one and the same thing alwayes, so as to perceive it _clearly_, and the Remembrance of what _Judgement_ I have formerly made is often stirred up, when I cease attending to those reasons for which I passed such a Judgment, other Reasons may then be produced, which (if I did not _know God_) may easily _move_ me in my _Opinion_; and by this means I shall never attain to the _true_ and _certain Knowledge_ of any Thing, but _Wandring_ and _Unstable opinions_. So, for example, when I consider the Nature of a Triangle, it plainly appears to me (as understanding the Principles of Geometry) that its three Angles are equal to two right ones; And this I must of necessity think _True_ as long as I attend to the _Demonstration_ thereof; but as soon as ever I withdraw my Mind from the _Consideration_ of its _Proof_ (altho I remember that I have once _Clearly_ perceived it) yet perhaps I may _doubt_ of Its _Truth_, being as yet _Ignorant_ of a _God_; For I may perswade my self, that I am so framed by _Nature_, as to be _deceived_ in those things which I imagine my self to perceive most _evidently_, Especially when I recollect, that heretofore I have often accounted many things _True_ and _Certain_, which afterward upon other Reasons I have Judged as False. But when I perceive that there is a _God_; because at the same time I also Understand that all things _Depend_ on Him, and that he is not a _Deceiver_; and when from hence I Collect that all those Things which I _clearly_ and _distinctly_ perceive are _necessarily True_; tho I have no further Respects to those Reasons which induced me to believe it _True_, yet if I do but remember, that I have _once clearly_ and _distinctly_ perceived it, no Argument can be brought on the contrary, that shall make me _doubt_, but that I have _true_ and _certain_ Knowledge thereof; and not onely of that, but of all other _Truths_ also which I remember that I have _once Demonstrated_, such as are _Geometrical Propositions_ and the like.