To reconstruct a critique of the ontological proof of the existence of God in Schelling’s philosophy I examine his interpretation of the ontological argument by Anselm of Canterbury and Descartes as well as Schelling’s assessment of the critique of the Kantian ontological proof of the existence of God. I propose a reconstruction of Schelling’s account of undoubted being which cannot be deduced from the concept of the totality of all that is possible and therefore must come before any thought. He interprets reason as having an ecstatic nature which posits precedent undoubted being. This enables Schelling to formulate his own version of the thesis on the unity of being and thought, whereby being comes first and thought is only second. Against...