F. W. J. von Schelling (1775-1854) is my least favorite of the major German idealists. He is the one most strongly associated with Romanticism, and has been considered a precursor of existentialism, which does not seem to me like a recommendation. He lacked Hegel’s grounding in Aristotle and more serious engagement with Kant. Even Schelling’s admirers don’t claim much for his rather undisciplined attempt at a Romantic philosophy of nature. He castigated Hegel for his rationalism, while reviving metaphysical use of the pretentious claim of intellectual intuition that Kant and Hegel fought against.
Like Fichte whom he at first followed, Schelling expressed himself in simpler and more approachable terms than Kant or Hegel, but at the cost of sacrificing the multidimensional richness Kant and Hegel both achieved. Like Fichte, he erred in making self-consciousness an immediate intellectual intuition rather than a dialectical development, but unlike Fichte, he also revived general use of intellectual intuition in metaphysics. Fichte is largely antithetical to me due to his hyper-strong subject-centeredness, but he was principled and had a razor-sharp intellect. Schelling is superficially more balanced, but what he balanced his Fichteanism with was a shallow Romantic pseudo-neoplatonism. Having spent a few years in close study of the real Greek neoplatonists, I am very unimpressed by Schelling’s heavy-handed forays into this territory.
Schelling is the one who really does ignore Kant’s warnings about unbridled speculation. Armed with intellectual intuition, he simply leaps into a (pseudo-neoplatonic rather than Hegelian) Absolute. Among his criticisms of Hegel was that Hegel made the Absolute a result attained from a finite starting point. Schelling said this was impossible, since the Absolute is infinite. This reflects a complete failure to understand the misleadingly named Hegelian Absolute, which was precisely not a humanly unachievable theological infinite, but carefully developed in terms that made it an Aristotelian perfection after a kind achievable in an understandable way by a finite rational being without intellectual intuition. (See also “Absolute” Knowledge?; Kantian Discipline; Copernican.)
Schelling in his “Identity philosophy” naively propounded the broadly neoplatonic theme of an original self-division of an infinite Absolute, without all the nuances developed by the Greek neoplatonists that made their version more interesting. (For both Aristotle and Hegel, in contrast to Schelling and the neoplatonists, the “first” principle is really an attractor and an end, not the metaphysical-theological origin of everything. I would not say “just” an end, because for both Aristotle and Hegel, ends are more important than origins.)
The late Schelling’s “Positive” philosophy again pitted intellectual intuition against reason, while also appealing to religious revelation. Early in his career, he had been influenced by the fideist F. H. Jacobi’s proto-Kierkegaardian idea that there is an uncrossable gap between “the conditioned” and “the unconditioned”, requiring a leap of faith. But at least after Jacobi publicly attacked him, Schelling distinguished his view from Jacobi’s more extreme anti-rationalism. (See also Being, Consciousness.)
In profound contrast to Kant, Fichte, and Hegel, across his career Schelling seems to have had no real interest in ethics. His Romantic reliance on intellectual intuition rather than dialectic also means that although he shares some core vocabulary with Hegel, the same terms have very different meanings. (See also Pure Thinking?)