sentences:  A systematic and complete development of his ideas is not given in any of his works, not even in his "Introduction to Speculative Theology", in which one would most naturally look for it.The starting-point of Günther's speculation is his theory of knowledge.Man is endowed with a twofold faculty of thought, the one a logical or conceptual function, which deals with appearances, and the other ontological, ideal, self-conscious, which penetrates through appearances to being; hence it is inferred that there are in man two essentially different thinking subjects.