reason now discovered were as utterly unknown to them as the sixth sense of the bat is to us. And as far as I am concerned, I must confess that I also, in my weakness, can not comprehend or imagine that reason which directly perceives or apprehends, or has an intellectual intuition of the super-sensible, the absolute, together with long yarns that accompany it, in any other way than as the sixth sense of the bat. This, however, must be said in favour of the invention or discovery of such a reason, which at once directly perceives whatever you choose, that it is an incomparable expedient for withdrawing oneself from the affair in the easiest manner in the world, along with one's favourite ideas, in spite of all Kants, with their Critiques of Reason. The invention and the reception it has met with do honour to the age.
Thus, although what is essential in reason ((
Greek characters), ratio, raison, Vernunft) was, on the whole and in general, rightly understood by all philosophers of all ages, though not sharply enough defined nor reduced to one point, yet it was not so clear to them what the understanding ((Greek characters), intellectus, esprit, Verstand) is. Therefore they often confuse it with reason, and just on this account they did not attain to a thoroughly complete, pure, and simple explanation of the nature of the latter. With the Christian philosophers the conception of reason received an entirely extraneous, subsidiary meaning through the opposition of it to revelation. Starting, then, from this, many are justly of opinion that the knowledge of the duty of virtue is possible from mere reason, i.e., without revelation. Indeed this aspect of the matter certainly had influence upon Kant's exposition and language. But this opposition is properly of positive, historical significance, and is therefore for philosophy a foreign element, from which it must keep itself free.
We might have expected that in his critiques of theoretical and practical reason Kant would have started with an exposition of the nature of reason in general, and, after
