Ren descartes

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Except our own thoughts, there is nothing absolutely in our power.
Reizen is bijna als praten met mensen uit andere eeuwen.
Reizen is bijna als praten met mensen uit andere eeuwen.
Each problem that I solved became a rule, which served afterwards to solve other problems.
If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.