Once in Germany again, he spent time in Dillingen, where he continued to correspond with humanist friends and colleagues throughout Europe. In correspondence, he primarily advocated for his project to promote the study of classical learning and the "Studia humanitatis". Agricola remained an independent scholar, unattached to a university or religious establishment. This independence became a hallmark of humanist scholars. In 1479, Agricola completed his "De inventione dialectica" ("On Dialectical Invention") in Dillingen, which argued for the precise application of "loci" in scholarly argumentation.