in keeping away from everything of which I know I can conceive the slightest doubt, just as if I knew that it was absolutely false

and I shall continue always in this path, until I have learned with certainty that there is nothing certain in the world

I suppose, therefore, that all things I see are false. I persuade myself that none of those things ever existed

what, then, shall we consider true?

perhaps only this - that there is nothing certain in the world...

Halo