Belief in God is rational. Everything has a cause. So unless there is a first cause, then you would have an infinite regress. And then nothing could exist. Therefore there must be a first cause. Therefore God, the first cause, exists. QED.
6.4.16
Kant
The greatest consideration should be given to the possibility of graded levels of reason. I mean to say that we have different levels of unconditioned realities. Modes of necessity. So in knowledge of these modes we ought to considered different levels of non intuitive immediate knowledge.
In short: How is a priori synthetic knowledge possible? you could say like the intutionists [Prichard G.E. Moore, Huemer, Bryan Caplan] that it is by reason. They are expanding the areas that reason knows for good cause. They look at Hume's argument that reason has only one function--to `perceive contradictions.They know that that is wrong. But we do have to admit the kind of reasoning we use to advance a mathematical series is different than the other kinds of intellectual perception that they suggest. That is they ignore Kant's arguments, not just Hume. So Plato could have answered the question how the forms participate with individuals, i.e., he could have answered the representation makes the object possible, and the object makes the representation possible.
I have my own reason to doubt Kant’s limitation of reason. it is this. Kant limits reason to areas of possible experience--i.e., metaphysics in its first part. however, the second half of metaphysics is not within the realm of possible experience--the universe as a whole, the soul, God. however, Kant admits that the only way we have even the simplest level of sensibility is that things in themselves affect our senses. so, I ask--how do we know that God, or the soul, or the universe as a whole do not affect our senses? after all we know nothing about things in themselves. maybe God is affecting our senses?-----יש לי סיבה משלי לפקפק במגבלת התבונה של קאנט. זוהי הסיבה. קאנט מגביל את התבונה לתחומים של חוויה אפשרית - כלומר, מטאפיזיקה בחלקה הראשון. עם זאת, המחצית השנייה של המטאפיזיקה אינה בתחום החוויה האפשרית - היקום בכללותו, הנשמה, אלוהים. עם זאת, קאנט מודה שהדרך היחידה שבה יש לנו אפילו את רמת הרגישות הפשוטה ביותר היא שדברים כשלעצמם משפיעים על חושינו. לכן, אני שואל - איך אנחנו יודעים שאלוהים, או הנשמה, או היקום בכללותו אינם משפיעים על חושינו? אחרי הכל, אנחנו לא יודעים כלום על דברים כשלעצמם. אולי אלוהים משפיע על חושינו
