I recall hearing in yeshiva that one great rabbi -- I think one of the baalei mussar? once said:
If a horse had the mind of Kant, it would author volume after volume of great philosphical works -- all about that a horse should eat oats.
(The point is that halacha is focused on an external source of ultimate truth, whereas Kant was all about innate moral sense.)
Can anyone identify who said this, please?