It is said that the spirits of darkness tremble with affright when they behold the sword of an executioner. How, then, must they stand aghast when confronted with Kant's _Critique of Pure Reason_! This book is the sword with which, in Germany, theism was decapitated. To be candid, you French are tame and moderate compared with us Germans. At the most, you have slain a king; and he had already lost his head before he was beheaded. And withal you must drum so much, and shout, and stamp, so that the whole world was shaken by the tumult. It is really awarding Maximilian Robespierre too much honour to compare him with Immanuel Kant. Maximilian Robespierre, the great citizen of the Rue Saint Honoré, did truly have an attack of destructive fury when the monarchy was concerned, and he writhed terribly enough in his regicidal epilepsy; but as soon as the Supreme Being was mentioned, he wiped the white foam from his mouth and the blood from his hands, put on his blue Sunday coat with the bright buttons, and attached a bouquet of flowers to his broad coat-lapel. The life-history of Immanuel Kant is difficult to write, for he had neither a life nor a history. He lived a mechanical, orderly, almost abstract, bachelor life, in a quiet little side-street of Königsberg, an old city near the north-east boundary of Germany. I believe that the great clock of the cathedral did not perform its daily work more dispassionately, more regularly, than its countryman, Immanuel Kant. Rising, coffee-drinking, writing, collegiate lectures, dining, walking--each had its set time. And when Immanuel Kant, in his grey coat, cane in hand, appeared at the door of his house, and strolled towards the small linden avenue, which is still called "the philosopher's walk," the neighbours knew it was exactly half-past four. Eight times he promenaded up and down, during all seasons; and when the weather was gloomy, or the grey clouds threatened rain, his old servant Lampe was seen plodding anxiously after, with a large umbrella under his arm, like a symbol of Providence. What a strange contrast between the outer life of the man and his destructive, world-convulsing thoughts! Had the citizens of Königsberg surmised the whole significance of these thoughts, they would have felt a more profound awe in the presence of this man than in that of an executioner, who merely slays human beings. But the good people saw in him nothing but a professor of philosophy; and when at the fixed hour he sauntered by, they nodded a friendly greeting, and regulated their watches.