The Concept of God Author:Vladimir Solovyov, George L. Kline, Boris Jakim, Aleksandr Vvedensky A philosophical polemic between two leading Russian philosophers of the 19th century over Spinoza's concept of God. Vvedensky's accusation that Spinoza's philosophy is basically atheistic stimulated Solovyov to give his most detailed discussion of God, both in defense of Spinoza and of himself.