process, so that, at last, the result is looked for there, and there only. The validity of intuition is disallowed." Jacobi's polemics were directed therefore against the systems of Spinoza, Leibnitz, Wolf--in a word against all systems that led to scepticism and dogmatism; and his positive efforts were employed in constructing a system of Faith. His key-word was "Faith," by which he meant intuition, the power of gazing immediately on essential truth; an intellectual faculty which he finally called Reason, by which supersensual objects become visible, as material objects become visible to the physical eye; an inward sense, a spiritual eye, that "gives evidence of things not seen and substance to things hoped for;" a faculty of vision to which truths respecting God, Providence, Immortality, Freedom, the Moral Law, are palpably disclosed. Kant had pronounced it impossible to prove that the transcendental idea had a corresponding reality as objective being. Jacobi declared that no such proof was needed; that the reality was necessarily assumed. Kant had denied the existence of any faculty that could guarantee the existence of either a sensual or a supersensual world. Jacobi was above all else certain that such a faculty there was, that it was altogether trustworthy, and that it actually furnished material for religious hope and spiritual life: the only possible material, he went on to say; for without this capacity of intuition, philosophy could be in his judgment nothing but an insubstantial fabric, a castle in the air, a thing of definitions and terminologies, a shifting body of hot and cold vapor. This, it will be observed, seemed a legitimate consequence of Kant's method. Kant had admitted the subjective reality of sensible impressions, and had claimed a similar reality for our mental images of supersensible things. He allowed the validity _as conceptions_, the practical validity, of the ideas of God, Duty, Immortality. Jacobi contended that having gone so far, it was lawful if not compulsory to go farther; that the subjective reality implied an objective reality; that the practical inference was as valid as any logical inference could be; and that through the intuition of reason the mind was placed again in a living universe of divine realities.