Nature, Noumenon, Phenomenon

A cardinal feature of the conventional Morality and Theology that Kant attempts to protect from Spinoza's doctrine is its Super-Natural vs. Natural dualism.  A significant example of his commitment to the conventional doctrine is his adoption of that dualism to characterize one of the cardinal features of his Rational system--Noumenon vs. Phenomenon.  Stripped of that commitment, the similarities between the Noumenon-Phenomenon contrast and Spinoza's Naturing Nature-Natured Nature emerge.  For example, on that basis, it is easier to recognize Pure Practical Reason as an immanent, rather than transcendent, force.  Likewise, the force is thus not experienced in Deontic terms, i. e. as a command of Duty that must be obeyed.  Instead, the content of the Principle of Pure Practical Reason gives expression to the conflict between the internal force and outer influences, and, hence, functions as an instructive development of Spinoza's doctrine.  But he squanders the opportunity for a fuller exposition, instead adapting the analysis to a conventional drama of divine reward for obedience to duty, and, instead of acknowledging Spinoza's influence, turns on him.