Two Things Fill The Mind With

This is the most celebrated passage from the Critique of Practical Reason (1788), which appears in the concluding section titled "General Remark on the Pure Practical Reason." Kant used it to illustrate the two sources of moral wonder: the empirical grandeur of the cosmos and the rational authority of the moral law within every person. The passage is inscribed on Kant's tomb in Königsberg (now Kaliningrad) and is widely regarded as the most eloquent summary of his philosophical project.