I am a thinking substance, that is, a mind, or soul, or intellect, or reason.
Cogito ergo sum
Meditations on First Philosophy, Meditation II
1641
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"I think, therefore I am a doubt."
Controversial"I concluded that I was a substance whose whole essence or nature consists in thinking, and whose being does not depend on any place or any material thing."
Controversial"The soul truly exists."
Shocking"I am a thinking thing, that is to say a mind, or a soul, or an understanding, or a reason."
Controversial"It is proper to a philosopher to doubt everything, at least once."
Controversial