Since Hegel of all philosophers launched the most ambitious and detailed attempt to conceive a fully-mediated synthesis of subject and object, this discussion has tried to determine where his conception falls short and what of positive value can be taken from it. The main conclusion was that his philosophical logic remains ontologically under-determined, and that the place of the concept of sensibility in his thought provides the best location for demonstrating this. This under-determination of logic by ontology has many consequences for his thought, but results particularly in an inadequate conception of the soul or mind-body relation and in a failure to grasp fully the implications of Kant’s claim that it cannot be known.