During the next few years Lassalle's literary activity was considerable. Besides a tragedy of no merit ("Franz von Sickingen," 1859) and various pamphlets or lectures on Fichte, on Lessing, on the Constitution, on Might and Right, he published in 1861 the most important work he has left us, his "System of Acquired Rights," and in 1862 a satirical commentary on Julian Schmidt's "History of German Literature," which excited much attention and amusement at the time. His "System of Acquired Rights" already contains the germs of his socialist views, and his pamphlet on the Constitution, which appeared when the "new era" ended and the era of Bismarck began, is written to disparage the Constitutionalism of modern Liberals. A paper constitution was a thing of no consequence; it was merely declarative, not creative; the thing of real account was the distribution of power as it existed in actual fact. The king and army were powers, the court and nobility were powers, the populace was a power. Society was governed by the relative strength of these powers, as it existed in reality and not by the paper constitution that merely chronicled it. Right is regarded as merely declarative of might. It is thus easy to see why he should have more sympathy with the policy of Bismarck than with the Liberals; and later in the same year he expounded his own political position very completely in a lecture he delivered to a Working Men's Society in Berlin, on "The Connection between the Present Epoch of History and the Idea of the Working Class." This lecture, to which I shall again revert, was an epoch in his own career. It led to a second Government prosecution, and a second imprisonment for political reasons; and it and the prosecution together led to his receiving an invitation to address a General Working Men's Congress at Leipzig, in February, 1863, to which he responded by a letter, sketching the political programme of the working class, which was certainly the first step in the socialist movement.