Since they furnish grounds for both sides, he contended that there must be some truth in both views. He also suggested that all religious communities drop their identification labels—Lutherans, Calvinists, Hussites, Waldensians—and proclaim Christ to be their leader by calling themselves simply Christians. Comenius not only worked toward Christian unity himself, he also supported the work of other ecumenical workers. He befriended John Dury, son of a Presbyterian minister at Edinburgh, Scotland,