It ranks, up to our own day, as the last of the great philosophies, and the boldest of all.
In this endeavour he forms with Herbart an opposition to the philosophies of Fichte, Schelling and Hegel, which aimed at objective and absolute knowledge, and also to the criticism of Kant, which aimed at determining the validity of all human knowledge.
As long as the battle of the philosophies endures, theism can hardly be unified.
Again, these contrasted philosophies throw light upon the meaning of a posteriori and a priori in Kant and subsequent writers.
Thus we might restate our grouping of philosophies in terms of the views they take regarding necessity.