During the early 1890s, Grabowski became unsatisfied by the slow spread of Esperanto. Believing that "imperfections" in the language were responsible for the slow pace, he pleaded for reform. In a vote among Esperantists that took place in 1894, however, he voted against changes to the language. For a number of years he worked on a planned language of his own he called "Modern Latin", advising his friend Edgar de Wahl during the early creation of his language Occidental to give up the search to find regularity in naturalistic auxiliary languages and join him on his purely naturalistic project instead. Not long after, however, he gave up on the idea and adhered to the basic principles of Esperanto as originally espoused by Zamenhof, the so-called "Fundamento de Esperanto".