The Basis of Morality by Part 2 Chapter 5 Page 10

And they should keep, who can.

— (WORDSWORTH.)

In the foregoing chapter we showed that the Kantian leading principle of Ethics is devoid of all real foundation. It is now clear that to this singular defect must be added, notwithstanding Kant's express assertion to the contrary, its concealed hypothetical nature, whereby its basis turns out to be nothing else than Egoism, the latter being the secret interpreter of the direction which it contains. Furthermore, regarding it solely as a formula, we find that it is only a periphrasis, an obscure and disguised mode of expressing the well-known rule: Quod tibi fieri non vis, alteri ne feceris (do not to another what you are unwilling should be done to yourself); if, that is, by omitting the non and ne, we remove the