"VIII. By eternity, I mean existence itself, in so far as it is conceived necessarily to follow solely from the definition of that which is eternal."
"Explanation—Existence of this kind is conceived as an eternal truth, like the essence of a thing, and, therefore, cannot be explained by means of continuance or time, though continuance may be conceived without a beginning or end." -- Ethics, Part I. Concerning God
Spinoza says that eternity or eternal can’t be defined by time/continuance. He says eternal/eternity implies essence. Hence, is essence the definition of eternity and vice versa according to Spinoza?