To the former he owes his appreciation of exact investigation and a complete knowledge of the aims of science, to the latter an equal admiration for the great circle of ideas which had been diffused by the teaching of Fichte, Schelling and Hegel.
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.
The idealisms of Fichte and Schelling made contributions to Hegel's thought; Krause and the Roman Catholic Baader represent parallel if minor phases of idealism.
In the earlier writings of Schelling, containing the philosophy of identity, existence is represented as a becoming, or process of evolution.
The side of this process which Schelling worked out most completely is the negative side, that is, nature.