I should start with an apology or an excuse why I am not going with G.E. Moore, Michael Huemer, and Prichard.[The Intuitionist.] The reason is that Hume's critique of a priori involved more that just limiting pure reason to find things that can be derived from definitions. The idea was also that there is nothing to check a priori knowledge against.-No way of checking your homework. No measuring stick.
This essay is probably the only real new idea I have ever come up with in philosophy.
But to present it properly I would in fact have to do more background work in Schopenhauer and show why he rejected Kant's dinge an sich (things in themselves) for his ding an sich (the thing in itself)--the Will. Also I would have to present an argument to show it can be revealed-and that is all too much for a single essay.
Kant and Ross
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Here is Ross's treatment of Kant's Ethics.
My own feeling about all this really starts from Schopenhauer. That is the dinge an sich (the Thing in Itself) is the Will (that is the First Cause). Then the world is a representation of this Will. That is Schopenhauer in a nut shell. What I think to add to this is that the Dinge an Sich needs to be uncovered. But I also see graduations of Being [note 1.]. And the good self is a representation of the Dinge an Sich. [Not the bad self which is a representation of the opposite.] And that good self needs to be uncovered. [note 2]
[note 1.] I am building here on Aristotle and also on an idea I had a few years ago that goes like this. modes are things that apply to substances. That is the substance is the unchanging layer underneath that does not change. Water can be hot or cold. But water itself can go out of existence. I can boil it. What is water a mode of? What underlying substance is it a mode of?
[note 2] I am not going exactly with Kant here. I agree the Ding an Sich (the thing in itself) is covered. We can only tell that it exists but its characteristics are only phenomena. But I think the ding can be uncovered.
This is different than Heidegger. What I am saying is that though to Kant there is no window to the ding an sich ((the thing in itself)) still I hold the Will reveals itself. And that we can participate in its revelation by morality. That is the the representation or emanation of the will is half subject and half object.
Appendix
1) איה מקום כבודו. "Where is the place of his glory?" The graduations of being are from Aristotle. [I relate very much to this idea of searching for God. Where is the place of his glory? מלא כל הארץ גבודו.
2) And this is a teleological approach to morality. But also
deontological ethics -the rules are what brings to revelation of the Will.
This I am basing on Maimonides {Rambam}. That is natural law was the first revelation to Abraham. Then came the later revelation of Mount Sinai that was not independent of natural law but built on it and also is in fact deontogical. We can see this in the Talmud itself. דורשין טעמה דקרא. We go by the reason for the law--not by the law according to Rabbi Shimon ben Yochai. The Sages disagree -and say we go by the law, not by its reason. But they agree there are reasons and that they are known. As we see in the end of chapter 9 in Bava Metzia,.
The Rambam goes into all this in the Guide and here I am giving just a quick sketch of my ideas based on the Rambam. Dr Ross also has an essay on his site which goes into the Rambam and gives some details I have left out here.
3) What I left out from the above essay is that both natural law and Mount Sinai Law needed and need revelation. They are both uncovering of the Will. To Maimonides neither is accessible to human reason.
the whole creation is to reveal the glory of God based on the verse כל הנקרא בשמי ולכבודי בראתיו יצרתיו אף עשיתיו everything that is called by my name I have created for my glory and also formed it and made it. And it was all made by ten statements and so every part of creation reveals some different aspect of the ten statements. Now even though "the whole world is full of his glory" still there are places where his glory can't spread to--that is bad places. So how do they exist? By the hidden statement. That is the highest of all the statements. So when a person seeks God from there he returns to the highest level.
4) The self is to Kant also what we call the ding an sich. This is important for his transcendental deduction. the self can be connected with the Will by speaking truth always the truth which is the light of God is contained inside of one.
5) The dinge an sich of Schopenhauer and Kant are not the same thing. What I meant to show up above is that they are related. The Dinge an sich is contained in the smaller dinge an sichs