In the Infallible Word, Van Til articulates the Reformed Orthodox conception of archetypal and ectypal theology.
Below are some answers I provided to questions as an assignment in seminary:
What is meant by the perspicuity of natural revelation?
God's revelation in nature was always meant to serve alongside His special revelation. God is a revealing God and the perspicuity of nature is bound up in the fact that He voluntarily reveals. Both natural and special revelation would be impossible if God remained incomprehensible as He is in Himself (archetypal theology). Man cannot penetrate God as He is Himself - he cannot comprehend God. But created man may see clearly what is revealed clearly even if he does not see exhaustively. Man need not have exhaustive knowledge in order to know truly and certainly.
[1]
God's thoughts about Himself are self-contained but man is an analogue who thinks in covenant relation to the One who created him. Thus man's interpretation of nature follows what is fully interpreted by God. Man thinks God's thoughts after him - not comprehensively but analogically.
The Psalmist doesn't declare that the heavens possibly or probably declare the glory of God. Paul does not say that the wrath of God is probably revealed from heaven against all ungodliness and unrighteousness of men. Scripture takes the clarity of God's revelation for granted at every stage of human history.
[2] The God who speaks in Scripture cannot refer to anything that is not already authoritatively revelational of Himself for the evidence of His own existence.
[3] Everything exists that is His creation.
It is no easier for sinners to accept God in nature than it is for them to accept Him in Scripture. The two are inseparable in their clarity. We need the Holy Spirit to understand both. Man must be a Christian to study nature in a proper frame of mind.
How does Greek natural theology and the natural theology of Kant result in denying any rationality higher than itself?
Neither allow analogical reasoning to understand the world. They start from nature and try to argue for a god who must be finite in nature. It starts with a "mute" universe that has no revelation and makes it revelational only with respect to the autonomous mind of man. No distinction is made between Creator and creature.
Kant's great contribution to philosophy consisted in stressing the activity of the experiencing subject. It is this point to which the idea of a Copernican revolution is usually applied. Kant argued that since it is the thinking subject that itself contributes the categories of universality and necessity, we must not think of these as covering any reality that exists or may exist wholly independent of the human mind. The validity of universals is to be taken as frankly due to a motion and a vote; it is conventional and nothing more.
[4]
Plato and Aristotle, as well as Kant, assumed the autonomy of man. On such a basis man may reason univocally (have the same mind as God) and reach a God who is just an extension of the creature or he may reason equivocally and reach a God who has no contact with him at all.
[5] Man is left with either God being part of nature (pantheism) or being so transcendent that He cannot get into nature (deism).
We're now left with a world where the scientist supposedly interacts with the physical world and can learn about the world apart from any reference to God and "ministers" who speak about God's revelation that has no reference to history and interaction with the world. Man is fractured intellectually where reason deals with things of the world and faith deals with things that cannot affect reason or the world.
The very idea of Kant's Copernican revolution was that the autonomous mind itself must assume the responsibility for making all factual differentiation and logical validation. To such a mind the God of Christianity cannot speak. Such a mind will hear no voice but its own.
[6]
[1] The Infallible Word, p 278.
[2] Ibid, p 278.
[3] Ibid, p 279.
[4] Ibid, p 296.
[5] Ibid, p 297.
[6] Ibid, p 298.
