First an undergraduate and afterward a professor in the University of Koenigsberg, Kant quietly matured his principles, and was in no haste to communicate them to the world. He delivered his philosophy to his students in the form of lectures, and was extremely careful not to publish it until he was sure that his mind had arrived at its final conclusions. A student named Hippel, who had enjoyed his intimacy, was the first to give publicity to his opinions. He employed the medium of a novel. He forestalled their real author, and Kant was compelled to explain the matter openly as a breach of faith. Gradually the lecture-hall at Koenigsberg became full of hearers, who, in a little time, could gain admittance only with difficulty. The professor of philosophy was a magnet that drew to that bleak northern city students from all parts of the Continent. Finally the opportune moment arrived. Having written, rewritten, altered, and abridged until he looked upon his work as beyond his power of improvement, he now deemed his convictions permanently formed. So the _Critique of Pure Reason_ entered upon its career of victory. The literary and thinking world had learned but a little of it in Hippel's book; and now there seemed to be no inclination to probe the concise language of the master's work, for the task appeared greater than the fruits would justify. This hesitancy was a glaring testimony to the loose thinking and careless literary habits of those days. But the haste with which Kant prosecuted the authorship of his work, apart from the thoughts employed in its elaboration into a system, furnishes some ground of apology for the failure of the public to fathom it. "I wrote," he says in a letter to Moses Mendelssohn, "this product of at least twelve years of diligent reflection within a period of from four to five months, paying indeed the greatest attention to the contents, but unable, borne away, as it were, upon the wings of thought, to bestow that care upon the style which might have promoted a readier insight into my meaning on the part of the reader."