“If we apply these principles to all the fundamental theoretic subject matters, we will find that, just as in the objective order, theology precedes metaphysics, and metaphysics, the philosophy of nature, and the philosophy of man, which is one of its parts, and the whole of philosophy, as dealing with essences, the whole of science, as dealing with phenomenal accidents; so in the subjective order, the members of this series are perfectly reversed: science should be studied before philosophy, and the philosophy of man before the philosophy of nature, and these before metaphysics and theology.” (Alder p. 21)