The proof of the existence of God from the Idea of Him is in this wise: In this Notion existence is implied; and therefore it is true. Descartes proceeds further in the same direction, in so far as after the manner of empirical axioms he sets forth: (α) “There are different degrees of reality or entity, for the substance has more reality than the accident or the mode, and infinite substance has more than finite.” (β) “In the Notion of a thing existence is implied, either the merely potential or the necessary,” _i.e._ in the ‘I’ there is Being as the immediate certainty of an other-being, of the not-I opposed to the I. (γ) “No thing or no perfection of a thing which really exists _actu_ can have the Nothing as original cause of its existence. For if anything could be predicated of nothing, thought could equally well be predicated of it, and I would thus say that I am nothing because I think.” Descartes here arrives at a dividing line, at an unknown relationship; the Notion of cause is reached, and this is a thought indeed, but a determinate thought. Spinoza says in his explanation, “That the conceptions contain more or less reality, and those moments have just as much evidence as thought itself, because they not only say that we think, but how we think.” These determinate modes as differences in the simplicity of thought, had, however, to be demonstrated. Spinoza adds to this step in advance that “The degrees of reality which we perceive in ideas are not in the ideas in as far as they are considered merely as kinds of thought, but in so far as the one represents a substance and the other a mere mode of substance, or, in a word, in so far as they are considered as conceptions of things.” (δ) “The objective reality of Notions” (_i.e._, the entity of what is represented in so far as it is in the Notion), “demands a first cause in which the same reality is contained not merely objectively” (that is to say in the Notion), “but likewise formally or even _eminenter_—formally, that is perfectly likewise: _eminenter_, more perfectly. For there must at least be as much in the cause as in the effect.” (ε) “The existence of God is known immediately”—_a priori_—“from the contemplation of His nature. To say that anything is contained in the nature or in the Notion of a thing is tantamount to saying that it is true: existence is directly contained in the Notion of God. Hence it is quite true to say of Him that existence pertains of necessity to Him. There is implied in the Notion of every particular thing either a possible or a necessary existence—a necessary existence in the Notion of God, _i.e._ of the absolutely perfect Being, for else He would be conceived as imperfect.”[172]