The Basis of Morality by Part 1 Chapter 2 Page 13

Law” which Is alleged to be inherent in our reason; and then they complacently weave upon this such a confused and wide-reaching tissue of phrases that they succeed in rendering unintelligible the clearest and simplest relations of life: and all this, without ever once seriously asking themselves whether in point of fact there really does exist such a “Moral Law,” as a convenient code of morality, graven in our heads or hearts.

Hence I admit the especial pleasure I feel in proceeding to remove from Ethics its broad cushion of repose, and I unreservedly declare my intention of proving that Kant's Practical Reason and Categorical Imperative are completely unwarrantable, baseless, and fabricated assumptions; and I shall further show that Kant's whole system, like those of his predecessors, is in want of a solid foundation.