We may contrast this doctrine of the Trinity with Plato’s thought by calling attention to the fact that for Augustine the Trinity furnished the basis of the principles of unity and diversity in human knowledge. In other words the Trinity is for Augustine as for all orthodox Christians a conception without which knowledge were impossible to man. That there is plurality which man must seek to relate to some underlying unity, is patent to all men. From the earliest dawn of reflective thinking it has been the effort of man to find unity in multiplicity. But the difficulties that meet one when trying to speculate upon the question of unity and plurality are that if one begins with an ultimate plurality in the world, or we may say by regarding plurality as ultimate, there is no way of ever coming to an equally fundamental unity. On the other hand, if one should begin with the assumption of an ultimate abstract, impersonal unity, one cannot account for the fact of plurality. No system of thought can escape this dilemma. No system of thought has escaped this dilemma. Many systems of thought have denied one of the horns of the dilemma, but all that they have accomplished by doing this is to find relief in the policy of the ostrich.
What Augustine and all theistic thinkers after him have done is to say that in God, and more specifically in the triune God, lies the solution of this difficulty.
– Cornelius Van Til, A Survey of Christian Epistemology p. 47
If one maintains a soteriological theory in which the “natural man” is conceived of as able of his own accord to seek the truth because he has a true insight into his sorrowful condition, one cannot but become antitheistic epistemologically, in the sense that he must think of certain facts as existing in such a way that man can have knowledge of them without having knowledge of the true God. If no one can come to the Father but by Christ, and no one can say Christ to be Lord except through the Spirit, it is equally possible or equally impossible for man to come into contact with the Father or the Son or the Spirit. If one maintains that he can approach Christ of his own accord even if he is a sinner, he may as well say that he can approach the Father too. And if one can say that he knows what the fact of sin means without the enlightenment of the Holy Spirit, he may as well say that he can know other facts without reference to God. In fact he may as well say that he can know any and every fact without reference to God. If one fact can be known without reference to God there is no good reason to hold that not all facts can be known without reference to God. When the elephant of naturalism once has his nose in the door, he will not be satisfied until he is all the way in.
– Cornelius Van Til, A Survey of Christian Epistemology p.77
In consonance with this we may call attention to the fact that on the question of possibility the same difference of opinion exists that we found on the matter of predication. For the theist, possibility has its source in God, while for the antitheist, God has his source in possibility. Hence, what one will deem most possible, the other will consider altogether impossible.
Similarly, once more with the question of probability. For theism, God is the source of the probable. For antitheism, the probable is the source of God. Hence, what one thinks altogether probable, the other will think altogether improbable.
– Cornelius Van Til, A Survey of Christian Epistemology p.190
The final question, then, when considering the object of knowledge, is whether the spatial-temporal universe exists by itself or whether we must presuppose the existence of God in order to think intelligently of the spatial-temporal world. We found that, according to Christian theism, every individual object of knowledge to be known at all must be known in its relation to God. Then if one spatial object is to be known in its relation to another spatial object, the connection must be thought of as made by God. In other words, the universals of knowledge have their source in God. Similarly, if one object of knowledge is to be known in its relation to other objects of knowledge that have existed or will exist at another period of time, we must think of the connection as being made by the plan of God.
– Cornelius Van Til, A Survey of Christian Epistemology p.183
Since it is upon God’s command that the work must be undertaken, it is God’s command that gives one the assurance that the work will accomplish its purpose. Looking at matters by themselves, it would be worse than useless to undertake reasoning with unbelievers. But it is the deep conviction of the total depravity of man that makes one throw his whole reliance upon God in all respects, and not the least in this question of reasoning with unbelievers. It is only he who deeply believes in the total depravity of man that can really preach with conviction that his work will not be in vain. Since he is convinced that the ethical alienation has been against God and against nothing else, he also knows that God is able to remove the ethical alienation. He, therefore, trusts that the Holy Spirit to whom, in the economy of redemption, the task has been assigned of convicting the world of judgment, will use the means of rational argumentation to accomplish his task. This hope is not inconsistent with the conception of the immediacy of the work of the Holy Spirit. That immediacy is complete. Our arguments taken by themselves effect nothing, while the Holy Spirit may very well convict without the use of our argument as he may convict without the use of our preaching. Yet because God is himself a completely rational God and has created us in his image, there is every reason to believe that he will make argumentation effective.
– Cornelius Van Til, A Survey of Christian Epistemology p.196-197
We have already indicated that the Christian method uses neither the inductive nor the deductive method as understood by the opponents of Christianity, but that it has elements of both induction and of deduction in it, if these terms are understood in a Christian sense. Now when these two elements are combined, we have what is meant by a truly transcendental argument.
A truly transcendental argument takes any fact of experience which it wishes to investigate, and tries to determine what the presuppositions of such a fact must be, in order to make it what it is. An exclusively deductive argument would take an axiom such as that every cause must have an effect, and reason in a straight line from such an axiom, drawing all manner of conclusions about God and man. A purely inductive argument would begin with any fact and seek in a straight line for a cause of such an effect, and thus perhaps conclude that this universe must have had a cause. Both of these methods have been used, as we shall see, for the defense of Christianity. Yet neither of them could be thoroughly Christian unless they already presupposed God. Any method, as was pointed out above, that does not maintain that not a single fact can be known unless it be that God gives that fact meaning, is an anti-Christian method. On the other hand, if God is recognized as the only and the final explanation of any and every fact, neither the inductive nor the deductive method can any longer be used to the exclusion of the other. That this is the case can best be realized if we keep in mind that the God we contemplate is an absolute God.
– Cornelius Van Til, A Survey of Christian Epistemology p.10-11
By the deductive method as exercised, e.g., by the Greeks, was meant that one begins his investigations with the assumption of the truth and ultimacy of certain axioms, such as, for example, that of causal relation. The question whether these axioms rest in God or in the universe was in that case not considered to be of great importance. Not as though the question was not raised. Plato did consider the question whether God was back of the ideas or whether the ideas were back of God. Yet this question was not given the importance that we give to it. We must put the point more strongly. The question was, in effect, given the wrong answer. It was assumed that the true, the beautiful and the good rest in themselves, and that God is subordinate to them. For us the question is all-important. If the axioms on which science depends are thought of as resting in the universe, the opposite of the Christian position is in effect maintained. The only rationality they know of in the universe is then the mind of man. Hence the alternative may be stated by saying that according to the Christian position, the basis of human investigation is in God, while for the antitheistic position the basis of human investigation is in man.
Similarly with the more modern method of induction. What is meant by induction as a method of science is the gathering of facts without reference to any axioms, in order to find to what these facts may lead us. Many scientists claim this method to be the method of science. But we have already seen that the usual assumption underlying this method is the antitheistic one, that there may be any kind of fact. Hence the difference between the prevalent method of science and the method of Christianity is not that the former is interested in finding the facts and is ready to follow the facts wherever they may lead, while the latter is not ready to follow the facts. The difference is rather that the former wants to study the facts without God, while the latter wants to study the facts in the light of the revelation God gives of himself in Christ. Thus the antithesis is once more that between those for whom the final center of reference in knowledge lies in man, and those for whom the final center of reference for knowledge lies in God, as this God speaks in Scripture.
Accordingly, we pay scant attention to the historic quarrel between the apostles of deduction and the apostles of induction. Our quarrel is not with either of them in particular but with both of them in general.
– Cornelius Van Til, A Survey of Christian Epistemology p.8-9
At the outset it ought to be clearly observed that every system of thought necessarily has a certain method of its own. Usually this fact is overlooked. It is taken for granted that everybody begins in the same way with an examination of the facts, and that the differences between systems come only as a result of such investigations. Yet this is not actually the case. It could not actually be the case.
In the first place, this could not be the case with a Christian. His fundamental and determining fact is the fact of God’s existence. That is his final conclusion. But that must also be his starting point. If the Christian is right in his final conclusion about God, then he would not even get into touch with any fact unless it were through the medium of God. And since man has, through the fall in Adam, become a sinner, man cannot know and therefore love God except through Christ the Mediator. And it is in Scripture alone that he learns about this Mediator. Scripture is the Word of Christ, the Son of God and Son of man. No sinner knows anything truly except he knows Christ, and no one knows Christ truly unless the Holy Ghost, the Spirit sent by the Father and the Son, regenerates him. If all things must be seen “in God” to be seen truly, one could look ever so long elsewhere without ever seeing a fact as it really is.
If I must look through a telescope to see a distant star, I cannot first look at the star to see whether there is a telescope through which alone I could see it. If I must look through a microscope to see a germ, I cannot first look at the germ with the naked eye to see if there is a microscope through which alone I can see it. If it were a question of seeing something with the naked eye and seeing the same object more clearly through a telescope or a microscope, the matter would be different. We may see a landscape dimly with the naked eye and then turn to look at it through a telescope and see it more clearly. But such is not the case with the Christian position. According to it, nothing at all can be known truly of any fact unless it be known through and by way of man’s knowledge of God.
– Cornelius Van Til, A Survey of Christian Epistemology p.4-5
Every system of philosophy must tell us whether it thinks true knowledge to be possible. Or if a system of philosophy thinks it impossible for man to have a true knowledge of the whole of reality or even of a part of reality, it must give good reasons for thinking so. From these considerations, it follows that if we develop our reasons for believing that a true knowledge of God and, therefore, also of the world, is possible because actually given in Christ, we have in fact given what goes in philosophy under the name of epistemology. It will then be possible to compare the Christian epistemology with any and with all others. And being thus enabled to compare them all, we are in a position and placed before the responsibility of choosing between them. And this choosing can then, in the nature of the case, no longer be a matter of artistic preference. We cannot choose epistemologies as we choose hats. Such would be the case if it had been once for all established that the whole thing is but a matter of taste. But that is exactly what has not been established. That is exactly the point in dispute.
– Cornelius Van Til, A Survey of Christian Epistemology p.xiii-xiv
Now the only argument for an absolute God that holds water is a transcendental argument. A deductive argument as such leads only from one spot in the universe to another spot in the universe. So also an inductive argument as such can never lead beyond the universe. In either case there is no more than an infinite regression. In both cases it is possible for the smart little girl to ask, “If God made the universe, who made God?” and no answer is forthcoming. This answer is, for instance, a favorite reply of the atheist debater, Clarence Darrow. But if it be said to such opponents of Christianity that, unless there were an absolute God their own questions and doubts would have no meaning at all, there is no argument in return. There lie the issues. It is the firm conviction of every epistemologically self-conscious Christian that no human being can utter a single syllable, whether in negation or in affirmation, unless it were for God’s existence. Thus the transcendental argument seeks to discover what sort of foundations the house of human knowledge must have, in order to be what it is.
– Cornelius Van Til, A Survey of Christian Epistemology p.11