The Basis of Morality by Part 2 Chapter 2 Page 15

“categorical” for the external condition which is indissolubly attached to such conceptions by their very nature: for this gives rise, as explained above, to a contradictio in adjecto.

Kant, then, without more ado or any close examination, borrowed this imperative Form of Ethics from theological Morals. The hypotheses of the latter (in other words, Theology) really lie at the root of his system, and as these alone in point of fact lend it any meaning or sense, so they cannot be separated from, indeed are implicitly contained in, it.

After this, when he had expounded his position the task of developing in turn a Theology out of his Morals — the famous Moraltheologie — was easy enough. For the conceptions which are implicitly involved in his Imperative, and