Mens humana ipsum humanum corpus non cognoscit nec ipsum existere scit nisi per ideas affectionum quibus corpus afficitur.
English (Elwes 1883)
The human mind has no knowledge of the body, and does not know it to exist, save through the ideas of the modifications whereby the body is affected.
Modern English
The human mind does not know the human body, nor does it know that the body exists, except through the ideas of the affections by which the body is affected.