By the early 1840s, Heliade began expanding on his notion that modern Romanian needed to emphasize its connections with other Romance languages through neologisms from Italian, and, to this goal, he published ("Parallelism between the Romanian language and Italian", 1840) and ("Parallelism between the Romanian and Italian Dialects or the Form or Grammar of These Two Dialects", 1841). The two books were followed by a compendium, "Prescurtare de gramatica limbei româno-italiene" ("Summary of the Grammar of the Romanian-Italian Language"), and, in 1847, by a comprehensive list of Romanian words that had originated in Slavic, Greek, Ottoman Turkish, Hungarian, and German ("see Romanian lexis"). By 1846, he was planning to begin work on a "universal library", which was to include, among other books, the major the philosophical writings of, among others, Plato, Aristotle, Roger Bacon, René Descartes, Baruch Spinoza, John Locke, Gottfried Leibniz, David Hume, Immanuel Kant, Johann Gottlieb Fichte and Georg Wilhelm Friedrich Hegel.