Cogito Ergo Sum II

Augustine, Soliloquies, Book II, Chapter 1:

Reason: Thou who wilt know yourself, do you know that you are?
Augustin: I know.
Reason: Whence do you know?
Augustine: I know not.
Reason: Feelest you yourself to be simple, or manifold?
Augustine: I know not.
Reason: Knowest you yourself to be moved?
Augustine: I know not.
Reason: Knowest you yourself to think?
Augustine: I know.
Reason: Therefore it is true that you think.
Augustine: True.