The Basis of Morality by Part 2 Chapter 8 Page 9

Hence for a given person in every single case, there is absolutely only one way of acting possible: Operari sequitur esse Freedom belongs only to the intelligible character, not to the empirical. The operari (conduct) of a given individual is necessarily determined externally by motives, internally by his character; therefore everything that he does necessarily takes place. But in his esse (i.e., in what he is), there, we find Freedom. He might have been something different; and guilt or merit attaches to that which he is. All that he does follows from what he is, as a mere corollary. Through Kant's doctrine we are freed from the primary error of connecting Necessity with esse (what one is), and Freedom with operari (what one does); we become aware that this is a misplacement of terms, and that exactly the inverse arrangement is the true one.