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"".
Thoughts on the True Estimation of Living Forces
Written in 1744–46 and published in 1749, it reflected Kant's position as a metaphysical dualist at the time. In it he argues against the "vis motrix" ("moving force") view supported by Wolff and other post-Leibnizian German rationalists that proposed that bodies have no essential force, and claimed that, instead, the existence of an essential force can be proven by metaphysical arguments. Kant criticized Leibniz's followers for looking "no further than the senses teach," and stayed close to Leibniz's original "vis activa" ("active force"; also known as "vis viva", "living force") point of view.