 Ramus often shifted his opinions and constantly made quite substantial changes in his textbooks; sometimes he also reconsidered his views on important part of his writings, although he always stuck to the core of his program. During Ramus’ early years at the University of Paris he devoted himself to the disciplines or arts of the traditional trivium: grammar, rhetoric and dialectic. He formulated his ideas on logic in 1540s and the early 1550s, and it is during this period that he gave most explicit expression to his anti-Aristotelianism. In 1555 he published a logic textbook in French, entitled Dialectique, which in many ways provided a clear indication of his ambitions and aims. Although he had become well known for his Latin eloquence, he broke with the scholastic tradition by writing in the vernacular. The following year he published the same book in Latin under the title Dialecticae libri duo (henceforth Dialectica). It was later printed in many different languages, and hundreds of editions of the Latin version were published. The book was widely disseminated and used at schools and universities throughout Europe, mostly in the Protestant countries.