Man... i only cant help you because i have arguments that shows that this Descartes reasonings may be wrong/incomplete. And it would only confuse you instead help you... anyway, after you get this test, tell us, so i can say what this arguments are.

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"Everything we do, everything we are, rests on our personal power. If we have enough of it, one word uttered to us might be sufficient to change the course of our lives. But if we don't have enough personal power, the most magnificent piece of wisdom can be revealed to us and that revelation won't make a damn bit of difference." Don Juan Matus - Tales of Power