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"".
Answering the Question: What is Enlightenment?
"Answering the Question: What Is Enlightenment?" () is a 1784 essay by the philosopher Immanuel Kant. In the December 1784 publication of the "Berlinische Monatsschrift" ("Berlin Monthly"), edited by Friedrich Gedike and Johann Erich Biester, Kant replied to the question posed a year earlier by the Reverend Johann Friedrich Zöllner, who was also an official in the Prussian government. Zöllner's question was addressed to a broad intellectual public community, in reply to Biester's essay entitled: "Proposal, not to engage the clergy any longer when marriages are conducted" (April 1783) and a number of leading intellectuals replied with essays, of which Kant's is the most famous and has had the most impact. Kant's opening paragraph of the essay is a much-cited definition of a lack of Enlightenment as people's inability to think for themselves due not to their lack of intellect, but lack of courage.