Immanuel Kant
Kant published a second edition of the "Critique of Pure Reason" ("Kritik der reinen Vernunft") in 1787, heavily revising the first parts of the book. Most of his subsequent work focused on other areas of philosophy. He continued to develop his moral philosophy, notably in 1788's "Critique of Practical Reason" (known as the second "Critique") and 1797's "Metaphysics of Morals". The 1790 "Critique of Judgment" (the third "Critique") applied the Kantian system to aesthetics and teleology. It was in this critique where Kant wrote one of his most popular statements, ""it is absurd to hope that another Newton will arise in the future who will make comprehensible to us the production of a blade of grass according to natural laws"".
Friedrich August Kanne
Kanne wrote more than a dozen operas and works of incidental music to plays, including "La fedeltà" (1803), "Sappho" (1805), "Die Elfenköningin" (1805), "Orpheus und Eurydice" (1807), "Fernando und Miranda" (1808), "Mirandola oder Das Schwert der Rache" (1811), "Die Belagerten" (1813), "Deutscher Sinn" (1813), "Die gute Nachricht" (1814), "Das Schloß Theben oder Der Kampf der Flußgötter" (1817), "Die eiserne Jungfrau" (1822), "Malvina oder Putzerls Abenteuer" (1823), "Lindane oder Die Fee und der Haarbeutelschneider" (1824), "Die Zauberschminke oder das Land der Erfindungen" (1825), "Der Untergang des Feenreiches" (1826), "Philipp und Suschen oder Der falsche Jupiter" (1832), "Die Mainacht oder Der Blocksberg" (Berlin, 1834), partly to his own libretto. His patriotic play to which he also wrote incidental music, "Die Spinnerin am Kreuz" (1822), was for many years in repertory on Vienna stages. It has been suggested that the slow movement of Beethoven's Piano Concerto No. 4 is a piece of program music closely based on the finale of act 1 of Kanne's "Orpheus". Beethoven used a text by Kanne for his aria with chorus, "Germania", WoO 94. Kanne's further works include some symphonies, masses, piano works, and songs written to poems by Goethe, Schiller and Schlegel.