This sentence is a famous saying of Kant, a great German philosopher. It was first published in Critique of Pure Reason. Later, after Kant died, it became his epitaph.
Later, Li Zehou quoted this passage in On a Floating Life and retranslated it into a passage with more charm of China's poetry. His translation is "I am the best, the starry sky is shining;" The moral law is in my heart. "
This passage of Kant is extremely wonderful, which can be said to be a refined expression of his philosophical contribution. Here, fact cognition and moral cognition have finally found a connection, that is, human rationality, starry sky above the head and moral law in the heart are all supported by human rationality.