Υποθέτω ότι το σώμα δεν είναι παρά ένα άγαλμα ή μια μηχανή από πηλό, την οποία ο Θεός δημιουργεί με σαφή πρόθεση να μοιαζει όσο το δυνατόν περισσότερ… - René Descartes

I doubt, therefore I think, therefore I am.

To begin with, I see that it is impossible that God should ever deceive me. Only someone who has something wrong with him will engage in trickery or deception. That someone is able to deceive others may be a sign of his skill or power, but his wanting to deceive them is a sign of his malice or weakness; and those are not to be found in God. Next, I know from experience that I have a faculty of judgment; and this, like everything else I have, was given to me by God. Since God doesn’t want to deceive me, I am sure that he didn’t give me a faculty of judgment that would lead me into error while I was using it correctly.

Finally, if there be still persons who are not sufficiently persuaded of the existence of God and of the soul, by the reasons I have adduced, I am desirous that they should know that all the other propositions, of the truth of which they deem themselves perhaps more assured, as that we have a body, and that there exist stars and an earth, and such like, are less certain;