I might go much further, and say that to all those à priori moralists who deem it necessary to argue at all, utilitarian arguments are indispensable. It is not my present purpose to criticize these thinkers; but I cannot help referring, for illustration, to a systematic treatise by one of the most illustrious of them, the Metaphysics of Ethics, by Kant. [...] All he shows is that the consequences of their universal adoption would be such as no one would choose to incur.

What It Means

This is a placeholder explanation generated by the low-overhead model. It interprets "I might go much further, and say that to all those à priori moralists who deem it necessary to argue at all, utilitarian arguments are indispensable. It is not my present purpose to criticize these thinkers; but I cannot help referring, for illustration, to a systematic treatise by one of the most illustrious of them, the Metaphysics of Ethics, by Kant. [...] All he shows is that the consequences of their universal adoption would be such as no one would choose to incur." in the context of "John Stuart Mill, Utilitarianism, Ch. 1 : General Remarks." to mean that wisdom is timeless.