In this paper, I propose a reading of Spinoza’s theory of the eternity of the mind in light of his theory of essence and existence. Opposing in particular recent Platonist readings of this theory, rejecting the dichotomy between formal essence and actual essence, upon which they mostly rely, I argue that Spinoza’s conception of the eternity of the mind must be grasped in terms of different aspects of one and the same existence. I moreover suggest that, for Spinoza, the mind (...) was both sempiternal and eternal, without, however, those two aspects of the mind’s existence being identical. (shrink)