ENThe paper is actually considered the publication of unique work of Stefan Zizanij "Kathehizis" (Vilno, 1595, Ugorcy 1618) which was never republished. The text contains comments and historical descriptions. The author of the article tries to answer the question if Stefan Zizaiiy really had a heretical views and has come to conclusion that Zizanij’s theology is completely based on the Eeasten Christian theology.