Dúvida Cartesiana

Descartes' Meditations

MEDITATION I.

OF THE THINGS OF WHICH WE MAY DOUBT.

"1. SEVERAL years have now elapsed since I first became aware that I had accepted, even from my youth, many false opinions for true, and that consequently what I afterward based on such principles was highly doubtful; and from that time I was convinced of the necessity of undertaking once in my life to rid myself of all the opinions."

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