PART IV
I am in doubt as to the propriety of making my first meditations in the
place above mentioned matter of discourse; for these are so metaphysical,
and so uncommon, as not, perhaps, to be acceptable to every one. And yet,
that it may be determined whether the foundations that I have laid are
sufficiently secure, I find myself in a measure constrained to advert to
them. I had long before remarked that, in relation to practice, it is
sometimes necessary to adopt, as if above doubt, opinions which we discern
to be highly uncertain, as has been already said; but as I then desired to
give my attention solely to the search after truth, I thought that a
procedure exactly the opposite was called for, and that I ought to reject
as absolutely false all opinions in regard to which I could suppose the
least ground for doubt, in order to ascertain whether after that there
remained aught in my belief that was wholly indubitable. Accordingly,
seeing that our senses sometimes deceive us, I was willing to suppose that
there existed nothing really such as they presented to us; and because
some men err in reasoning, and fall into paralogisms, even on the simplest
matters of geometry, I, convinced that I was as open to error as any
other, rejected as false all the reasonings I had hitherto taken for
demonstrations; and finally, when I considered that the very same thoughts
(presentations) which we experience when awake may also be experienced
when we are asleep, while there is at that time not one of them true, I
supposed that all the objects (presentations) that had ever entered into
my mind when awake, had in them no more truth than the illusions of my
dreams.
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