Streszczenie
A first impulse to write this article came from noticing, while reading Descartes' "Meditations", that
author gives different meaning to the idea of "doubt" in each part of book. In First Meditation
"doubt" has a function of a unique method of research, first step to build new, strictly rational and
scientific knowledge – in contrast to the former collection of unjustified and un-proved or even false
conceptions. Therefore "doubt" has positive value. So why does Descartes in his evidence of God's
existence in Third Meditation, talks about "doubt" as if it were imperfection and weakness of human
nature? As if it were something worthless and part of "nothingness"? The only way to resolve this
contradiction is to consider thoroughly what the role of "doubt" is in each part of "Meditations". Then,
it will be clear that in Descartes' "Meditations" problem of knowledge is strictly attached to problem of
existence, and how order of cognition changes without notice into cognition of Divine Order.