The article is devoted to the interpretation of the ontological argument as a theoretical construction that is connected with understanding of the reflexive relationship of thinking and existence. The author concludes that the consistent implementation of this approach requires an appeal to the historically transitory forms of the ontological argument which reconstructs the logic of the evolution of reflexive systems. The ontological argument is considered as a developing theoretical construct. Therefore, theoretical constructs conceptualized as non-classical versions of the ontological argument (...) will constantly re-emerge. Emergence of the first non-classical version of the ontological argument is related to need of overcoming apriority of introduction of the idea of the absolute being which is typical for Cartesianism. This issue was realized in the Kantian doctrine of transcendental ideas, which presented mind as an independent essence that creates its own content. Thus, the metaphysical construction, conditionally referred to as “the moral proof of the existence of God,” is revealed in the paper as a non-classical variant of the ontological argument. However, while Kant could be content with faith in reality of other subjectivity as an object of moral action, Fichte’s scientific doctrine demanded a proof of objective reality of the concept of the other I. This issue was identical to a basic problem of an ontological argument. “The ontological argument of the other I” offered by Fichte was devoid of mysticism as it is indissolubly connected with the disclosure of the social nature of the human subjectivity. The last step in formation of the concept “non-classical version of the ontological argument” was taken in Hegelian philosophy, where the reflexive relations between the multitude of I’s were transformed to reflexive interconnection between God and man. The versions of ontological argument are considered in the paper as necessary stages which any theoretical model of reflexive systems has to pass in its formation. (shrink)