After his religious duties, Comenius's second great interest was in furthering the Baconian attempt at the organization of all human knowledge. He became one of the leaders in the encyclopædic or pansophic movement of the seventeenth century, and, in fact, was inclined to sacrifice his more practical educational interests and opportunities for these more imposing but somewhat visionary projects. In 1639, Comenius published his "Pansophiæ Prodromus", and in the following year his English friend Hartlib published, without his consent, the plan of the pansophic work as outlined by Comenius. The pansophic ideas find partial expression in the series of textbooks he produced from time to time. In these, he attempts to organize the entire field of human knowledge so as to bring it, in outline, within the grasp of every child. Comenius also attempted to design a language in which false statements were inexpressible.