In the study the author outlines the background of two conceptually and practically related circles of questions, which are most significantly connected with the reform efforts of Rakoczi's state in the work of the outstanding scholar from Hungary Matej Bel (1684 - 1749), namely the problems of ethnic and religious tolerance. The scientific and ecclesiastical-political conception carefully constructed by Matej Bel has two basic pillars. One is the ability of national, ethnic and social group coexistence. The second is a natural factor of the coexistence of these groups, namely religious tolerance. A basic principle of the lifelong scientific programme of Matej Bel was to express his view on the question of religious tolerance, which we want to examine through analysis of his hitherto unknown work 'Kurtze Erzehlung der Religions Geschicht in Ungarn occasione der Rakoczischen Revolution in Ungarn'. At the end of the first decade of the 18th century, after the Ruzomberok synod, which, in political terms, meant a split in the Evangelical Church, he remained among those who rejected in principle a policy of discrimination.