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After these reflections I knew that whatever I do not know in this fashion and
with this mode of certainty is not reliable and infallible knowledge; and
knowledge that is not infallible is not certain knowledge.

1) The Approach of Sophists and Rejecting Knowledge

Thereupon I investigated the various kinds of knowledge I had, and found
myself destitute of all knowledge with this characteristic of infallibility, except in
the case of sensible knowledge [the five senses] and the obvious. So I said,
“Now that despair has come over me, there is no point in addressing any
problems except on the basis of what is self-evident, namely the sensible
knowledge and the obvious. So I must perfect this first in order that I become
certain regarding sensible knowledge, same kind as my previous trust in the
beliefs I had merely taken over from others and as the trust most men have in
the results of thinking? Or is it a justified trust that is in no danger of being
betrayed or destroyed‟?

I therefore proceeded with extreme seriousness to reflect on sensible
knowledge and the obvious, to see whether I could make myself doubt them. The