Other propositions have been set against that of Descartes. Gassendi,[161] for example, asks if we might not just as well say Ludificor, ergo sum: I am made a fool of by my consciousness, therefore I exist—or properly speaking, therefore I am made a fool of. Descartes himself recognized that this objection merited consideration, but he here repels it, inasmuch as it is the ‘I’ alone and not the other content which has to be maintained. Being alone is identical with pure thought, and not its content, be it what it may. Descartes further says: “By thought I, however, understand all that takes place in us within our consciousness, in as far as we are conscious of it; thus will, conception, and even feeling are identical with thought. For if I say ‘I see,’ or ‘I walk out,’ and ‘therefore I am,’ and understand by this the seeing and walking which is accomplished by the body, the conclusion is not absolutely certain, because, as often happens in a dream, I may imagine that I can see or walk even if I do not open my eyes nor move from my place, and I might also possibly do so supposing I had no body. But if I understand it of the subjective feeling or the consciousness of seeing or walking itself, because it is then related to the mind that alone feels or thinks that it sees or walks, this conclusion is perfectly certain.”[162] “In a dream” is an empirical mode of reasoning, but there is no other objection to it. In willing, seeing, hearing, &c., thought is likewise contained, it is absurd to suppose that the soul has thinking in one special pocket, and seeing, willing, &c., in others. But if I say ‘I see,’ ‘I walk out,’ there is present on the one hand my consciousness ‘I,’ and consequently thought, on the other hand, however, there is present willing, seeing, hearing, walking, and thus a still further modification of the content. Now because of this modification I cannot say ‘I walk, and therefore I am,’ for I can undoubtedly abstract from the modification, since it is no longer universal Thought. Thus we must merely look at the pure consciousness contained in the concrete ‘I.’ Only when I accentuate the fact that I am present there as thinking, is pure Being implied, for only with the universal is Being united.
“In this it is implied,” says Descartes, “that thought is more certain to me than body. If from the fact that I touch or see the earth I judge that it exists, I must more certainly judge from this that my thought exists. For it may very well happen that I judge the earth to exist, even if it does not exist, but it cannot be that I judge this, and that my mind which judges this does not exist.”[163] That is to say, everything which is for me I may assert to be non-existent, but when I assert myself to be non-existent, I myself assert, or it is my judgment. For I cannot set aside the fact that I judge, even if I can abstract from that respecting which I judge. In this Philosophy has regained its own ground that thought starts from thought as what is certain in itself, and not from something external, not from something given, not from an authority, but directly from the freedom that is contained in the ‘I think.’ Of all else I may doubt, of the existence of bodily things, of my body itself; or this certainty does not possess immediacy in itself. For ‘I’ is just certainty itself, but in all else this certainty is only predicate; my body is certain to me, it is not this certainty itself.[164] As against the certainty we feel of having a body, Descartes adduces the empirical phenomenon that we often hear of persons imagining they feel pain in a limb which they have lost long ago.[165] What is actual, he says is a substance, the soul is a thinking substance; it is thus for itself, separate from all external material things and independent. That it is thinking is evident from its nature: it would think and exist even if no material things were present; the soul can hence know itself more easily than its body.[166]
All else that we can hold as true rests on this certainty; for in order that anything should be held as true, evidence is requisite, but nothing is true which has not this inward evidence in consciousness. “Now the evidence of everything rests upon our perceiving it as clearly and vividly as that certainty itself, and on its so entirely depending from, and harmonizing with this principle, that if we wished to doubt it we should also have to doubt this principle likewise” (our ego).[167] This knowledge is indeed on its own account perfect evidence, but it is not yet the truth, or if we take that Being as truth, it is an empty content, and it is with the content that we have to do.
c. What comes third is thus the transition of this certainty into truth, into the determinate; Descartes again makes this transition in a naïve way, and with it we for the first time begin to consider his metaphysics. What here takes place is that an interest arises in further representations and conceptions of the abstract unity of Being and Thought; there Descartes sets to work in an externally reflective manner. “The consciousness which merely knows itself to be certain now however seeks to extend its knowledge, and finds that it has conceptions of many things—in which conceptions it does not deceive itself, so long as it does not assert or deny that something similar outside corresponds to them.” Deception in the conceptions has meaning only in relation to external existence. “Consciousness also discovers universal conceptions, and obtains from them proofs which are evident, e.g. the geometric proposition that the three angles of a triangle are together equal to two right angles is a conception which follows incontrovertibly from others. But in reflecting whether such things really exist doubts arise.”[168] That there is such a thing as a triangle is indeed in this case by no means certain, since extension is not contained in the immediate certainty of myself. The soul may exist without the bodily element, and this last without it, they are in reality different; one is conceivable without the other. The soul thus does not think and know the other as clearly as the certainty of itself.[169]
Now the truth of all knowledge rests on the proof of the existence of God. The soul is an imperfect substance, but it has the Idea of an absolute perfect existence within itself; this perfection is not begotten in itself, just because it is an imperfect substance; this Idea is thus innate. In Descartes the consciousness of this fact is expressed by his saying that as long as the existence of God is not proved and perceived the possibility of our deceiving ourselves remains, because we cannot know whether we do not possess a nature ordered and disposed to err (supra, p. 226).[170] The form is rather a mistaken one, and it only generally expresses the opposition in which self-consciousness stands to the consciousness of what is different, of the objective; and we have to deal with the unity of both—the question being whether what is in thought likewise possesses objectivity. This unity rests in God, or is God Himself. I shall put these assertions in the manner of Descartes: “Amongst these various conceptions possessed by us there likewise is the conception of a supremely intelligent, powerful, and absolutely perfect Being; and this is the most excellent of all conceptions.” This all-embracing universal conception has therefore this distinguishing feature, that in its case the uncertainty respecting Being which appears in the other conceptions, finds no place. It has the characteristic that “In it we do not recognize existence as something merely possible and accidental, as we do the conceptions of other things which we perceive clearly, but as a really essential and eternal determination. For instance, as mind perceives that in the conception of a triangle it is implied that the three angles are equal to two right angles, the triangle has them; and in the same way from the fact that mind perceives existence to be necessarily and eternally implied in the Notion of the most perfect reality, it is forced to conclude that the most perfect reality exists.”[171] For to perfection there likewise pertains the determination of existence, since the conception of a non-existent is less perfect. Thus we there have the unity of thought and Being, and the ontological proof of the existence of God; this we met with earlier (p. 63, seq.) in dealing with Anselm.
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]
Descartes likewise argues after this manner: “Problem: to prove a posteriori from the mere Notion within us the existence of God. The objective reality of a Notion demands a cause in which the same reality is not merely contained objectively” (as in the finite), “but formally” (freely, purely for itself, outside of us) “or eminenter” (as original). (Axiom δ.) “We now have a Notion of God, but His objective reality is neither formally nor eminenter contained within us, and it can thus be only in God Himself.”[173] Consequently we see that with Descartes this Idea is an hypothesis. Now we should say we find this highest Idea in us. If we then ask whether this Idea exists, why, this is the Idea, that existence is asserted with it. To say that it is only a conception is to contradict the meaning of this conception. But here it is unsatisfactory to find that the conception is introduced thus: ‘We have this conception,’ and to find that it consequently appears like an hypothesis. In such a case it is not proved of this content in itself that it determines itself into this unity of thought and Being. In the form of God no other conception is thus here given than that contained in Cogito, ergo sum, wherein Being and thought are inseparably bound up—though now in the form of a conception which I possess within me. The whole content of this conception, the Almighty, All-wise, &c., are predicates which do not make their appearance until later; the content is simply the content of the Idea bound up with existence. Hence we see these determinations following one another in an empirical manner, and not philosophically proved—thus giving us an example of how in a priori metaphysics generally hypotheses of conceptions are brought in, and these become objects of thought, just as happens in empiricism with investigations, observations, and experiences.
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.
“Now the first attribute of God is that He is true and the Giver of all light; it is hence quite contrary to His nature to deceive us. Hence the light of nature or the power of acquiring knowledge given us by God can affect no object which is not really true in as far as it is affected by it” (the power of acquiring knowledge) “i.e. as it is perceived clearly and distinctly.” We ascribe truth to God. From this Descartes goes on to infer the universal bond which exists between absolute knowledge and the objectivity of what we thus know. Knowledge has objects, has a content which is known; we call this connection truth. The truth of God is just this unity of what is thought by the subject or clearly perceived, and external reality or existence. “Thereby an end is put to doubt, as if it could be the case that what appears quite evident to us should not be really true. We can thus no longer have any suspicion of mathematical truths. Likewise if we give heed to what we distinguish by our senses in waking or in sleeping, clearly and distinctly, it is easy to recognize in each thing what in it is true.” By saying that what is rightly and clearly thought likewise is, Descartes maintains that man comes to know by means of thought what in fact is in things; the sources of errors lie on the other hand in the finitude of our nature. “It is certain, because of God’s truth, that the faculty of perceiving and that of assenting through the will, if it extends no further than to that which is clearly perceived, cannot lead to error. Even if this cannot be in any way proved, it is by nature so established in all things, that as often as we clearly perceive anything, we assent to it from ourselves and can in no wise doubt that it is true.”[176]