Proposition XXI. The mind can only imagine anything, or remember what is past, while the body endures.
Proposition XXII. Nevertheless in (Deus sive Natura) there is necessarily an idea, which expresses the essence of this or that human body under the form of eternity.
(Deus sive Natura) is the cause, not only of the existence of this or that human body, but also of its essence. This essence, therefore, must necessarily be conceived through the very essence of (Deus sive Natura), and be thus conceived by a certain eternal necessity and this conception must necessarily exist.
Proposition XXIII. The human mind cannot be absolutely destroyed with the body, but there remains of it something which is eternal.