(2.) Yet Jacobi essentially agrees with Kant’s critick of the understanding. Jacobi affirmed, as Kant had done, that the understanding is insufficient to know the supersensible, and that the highest ideas of the reason could be apprehended only in faith. Jacobi places Kant’s great merit in having cleared away the ideas, which were simply the products of reflection and logical phantasms. “It is very easy for the understanding, when producing one notion from another, and thus gradually mounting up to ideas, to imagine that, by virtue of these, which, though they carry it beyond the intuitions of the sense, are nothing but logical phantasms, it has not only the faculty but the most decided determination to fly truly above the world of sense, and to gain by its flight a higher science independent of the intuition, a science of the supersensible. Kant discovers and destroys this error and self-deception. Thus there is gained, at least, a clear place for a _genuine_ rationalism. This is Kant’s truly great deed, his immortal merit. But the sound sense of our sage did not allow him to hide from himself that this clear place must disappear in a gulf, which would swallow up in itself all knowledge of the true, unless a God should interpose to hinder it. Here Kant’s doctrine and mine meet.” (3.) But Jacobi does not fully agree with Kant, in wholly denying to the theoretical reason the faculty of objective knowledge. He blames Kant for complaining that the human reason cannot theoretically prove the reality of its ideas. He affirms that Kant is thus still entangled in the delusion, that the only reason why these ideas cannot be proved, is found in the nature of the ideas themselves, and not in the deficient nature of our knowledge. Kant therefore attempts to seek, in a practical way, a kind of scientific proof; a roundabout way, which, to every profound seeker, must seem folly, since every proof is as impossible as it is unnecessary.