Having arrived at existence, we next find ourselves among ideas, which at least are intelligible, if the character of them is as far removed as before from the circle of ordinary thought. Nothing exists except substance, the attributes under which substance is expressed, and the modes or affections of those attributes. There is but one substance self-existent, eternal, necessary, and that is the absolutely Infinite all-perfect Being. Substance cannot produce substance, and therefore there is no such thing as creation; and everything which exists is either an attribute of God, or an affection of some attribute of him, modified in this manner or in that. Beyond him there is nothing, and nothing like him or equal to him; he therefore alone in himself is absolutely free, uninfluenced by anything, for nothing is except himself; and from him and from his supreme power, essence, intelligence (for these words mean the same thing), all things have necessarily flowed, and will and must flow for ever, in the same manner as from the nature of a triangle it follows, and has followed, and will follow from eternity to eternity, that the angles of it are equal to two right angles. It would seem as if the analogy were but an artificial play upon words, and that it was only metaphorically that in mathematical demonstration we speak of one thing as following from another. The properties of a curve or a triangle are what they are at all times, and the sequence is merely in the order in which they are successively known to ourselves. But according to Spinoza, this is the only true sequence; and what we call the universe, and all the series of incidents in earth or planet, are involved formally and mathematically in the definition of God.