“Foundations of the Metaphysics of Morality” is an ethical treatise in which the greatest philosopher in Western Europe develops a philosophical justification for the moral law—the categorical imperative.
Only a rational being has a will, thanks to which it is capable of acting according to principles. And only a rational being, when it attains its desired goals, is able to be guided by the law of morality.
This and much more is discussed in “Foundations of the Metaphysics of Morality,” which became a prelude to the “Critique of Practical Reason.”
The collection also includes “Anthropology from a Pragmatic Point of View”—Kant’s last major work, written based on lecture notes, in which he systematizes contemporary philosophical knowledge about human beings.