Page "Argument from morality" Paragraph 10

Philosopher G. H. R. Parkinson notes a common objection to Kant's argument: that what ought to be done does not necessarily entail that it is possible.

He also argues that alternative conceptions of morality exist which do not rely on the assumptions that Kant makes – he cites utilitarianism as an example which does not require the summum bonum.

Nichola Everitt argues that much moral guidance is unattainable, such as the Biblical command to be Christ-like.

She proposes that Kant's first two premises only entail that we must try to achieve the perfect good, not that it is actually attainable.