Descartes then proceeds: “Mind is the more convinced of this when it notices that it discovers within itself the conception of no other thing wherein existence is necessarily implied. From this it will perceive that that idea of highest reality is not imagined by it, it is not chimerical, but a true and unalterable fact which cannot do otherwise than exist, seeing that existence is necessarily involved in it. Our prejudices hinder us from apprehending this with ease, for we are accustomed to distinguish in all other things the essence” (the Notion) “from the existence.” Respecting the assertion that thought is not inseparable from existence, the common way of talking is as follows: ‘If what men think really existed, things would be different.’ But in saying this men do not take into account that what is spoken of in this way is always a particular content, and that in it the essential nature of the finality of things simply signifies the fact that Notion and Being are separable. But how can one argue from finite things to the infinite? “This Notion,” Descartes continues, “is furthermore not made by us.” It is now declared to be an eternal truth which is revealed in us. “We do not find in ourselves the perfections which are contained in this conception. Thus we are certain that a first cause in which is all perfection, _i.e._ God as really existent, has given them to us; for it is certain to us that from nothing, nothing arises” (according to Boehme God derived the material of the world from Himself), “and what is perfect cannot be the effect of anything imperfect. From Him we must thus in true science deduce all created things.”[174] With the proof of the existence of God the validity of and evidence for all truth in its origin is immediately established. God as First Cause is Being-for-self, the reality which is not merely entity or existence in thought. An existence such as this first cause (which is not what we know as a thing) rests in the Notion of the not-I, not of each determinate thing—since these as determinate are negations—but only in the Notion of pure existence or the perfect cause. It is the cause of the truth of ideas, for the aspect that it represents is that of their Being. d. Fourthly, Descartes goes on to assert: “We must believe what is revealed to us by God, though we cannot understand it. It is not to be wondered at, since we are finite, that there is in God’s nature as inconceivably infinite, what passes our comprehension.” This represents the entrance of a very ordinary conception. Boehme on the other hand says (_supra_, p. 212): ‘The mystery of the Trinity is ever born within us.’ Descartes, however, concludes: “Hence we must not trouble ourselves with investigations respecting the infinite; for seeing that we are finite, it is absurd for us to say anything about it.”[175] This matter we shall not, however, enter upon at present.