Kant's exploration of the Fourth Question in his later years was essentially comprehensive,general,and summary in nature,especially in terms of his epistemology and moral philosophy.He placed his epistemology and moral philosophy within a broader scope.At the same time,there were important additions."What man ought to be"or"what man will be"is still constrained by"what man actually is",so it is necessary to recognize that humans possess not only rationality but also irrationality.The recognition of"human finitude"should not only see the finitude of cognition but also the finitude of morality and aesthetics.Although Kant did not propose a fundamental new theory or additional new principles specifically in answering the Fourth Question as he did in the first three,the formulation of the Fourth Question still holds significant value.Not only can we now observe all four of Kant's questions through the lens of the Fourth Question,but we can also observe the entirety of Kantian philosophy in this way.