Things are naturally contrary, that is, cannot exist in the same objec — Ethics (Spinoza book)

"God, or substance, consisting of infinite attributes, of which each expresses eternal and infinite essentiality, necessarily exists."

"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."

"Nothing in the universe is contingent, but all things are conditioned to exist and operate in a particular manner by the necessity of the divine nature."

"Extension is an attribute of God, or God is an extended thing."

"By reality and perfection I mean the same thing."

"That thing is called free, which exists solely by the necessity of its own nature, and of which the action is determined by itself alone. On the other hand, that thing is necessary, or rather constrained, which is determined by something external to itself to a fixed and definite method of existence or action."