After this I inquired in general into what is essential I to the truth and
certainty of a proposition; for since I had discovered one which I knew to
be true, I thought that I must likewise be able to discover the ground of
this certitude. And as I observed that in the words I think, therefore I
am, there is nothing at all which gives me assurance of their truth beyond
this, that I see very clearly that in order to think it is necessary to
exist, I concluded that I might take, as a general rule, the principle,
that all the things which we very clearly and distinctly conceive are
true, only observing, however, that there is some difficulty in rightly
determining the objects which we distinctly conceive.
In the next place, from reflecting on the circumstance that I doubted, and
that consequently my being was not wholly perfect (for I clearly saw that
it was a greater perfection to know than to doubt), I was led to inquire
whence I had learned to think of something more perfect than myself; and I
clearly recognized that I must hold this notion from some nature which in
reality was more perfect. As for the thoughts of many other objects
external to me, as of the sky, the earth, light, heat, and a thousand
more, I was less at a loss to know whence these came; for since I remarked
in them nothing which seemed to render them superior to myself, I could
believe that, if these were true, they were dependencies on my own nature,
in so far as it possessed a certain perfection, and, if they were false,
that I held them from nothing, that is to say, that they were in me
because of a certain imperfection of my nature.
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