Classical metaphysics, from Aristotle through Aquinas to Leibniz, conceives the highest reality as pure actuality — complete, fully determined, lacking nothing. Perfection is static. Schelling's later philosophy inverts this: the most real and most divine is not the already-completed but the still-becoming. The divine life is a movement from potency to act, from dark ground to luminous self-disclosure — and this movement is not a deficiency but the very form of genuine life. A God who simply is, without process or history, would be an idol, not the living God.
In the Ages of the World and the later philosophical lectures, Schelling structures the process of becoming through three potencies. The first potency is pure self-contraction — being as pure "can-be," sheer possibility that has not yet actualised itself. The second potency is the eruption of self-disclosure — being as "must-be," the compulsion toward existence. The third potency is the free, self-transparent reconciliation of the first two — being as "ought-to-be," the achieved unity of dark ground and luminous existence in the form of love. These three potencies map onto the traditional Christian Trinity, though Schelling is careful about how far this identification extends.
The logic of becoming implies that reality is genuinely open — the future is not already determined in the structure of the past but emerges through a process that includes real contingency and real freedom. This makes Schelling's ontology hospitable to genuine novelty in a way that rationalist idealism is not. The world is not the unfolding of a pre-given rational plan but the site of a drama whose outcome is not known in advance. This openness is what connects Schelling's process ontology to later existentialist and pragmatist themes.
The three-potencies framework is fully developed in the Erlangen lectures (1820–21) and the Berlin lectures on the Philosophy of Mythology and Revelation (1841–42). It represents Schelling's mature answer to Hegel's dialectic.