Karp Strigolnik, who in the 14th century preached the doctrine in Novgorod, explained that St. Paul had taught that simpleminded men should instruct one another; therefore they elected their "teachers" from among themselves to be their spiritual guides, and had no special priests. There is a tradition that the Bogomils taught that prayers were to be said in private houses, not in separate buildings such as churches. Ordination was conferred by the congregation and not by any specially appointed minister. The congregation were the "elect", and each member could obtain the perfection of Christ and become a Christ or "Chlist". Marriage was not a sacrament. Bogomils refused to fast on Mondays and Fridays, and they rejected monasticism. They declared Christ to be the Son of God only through grace like other prophets, and that the bread and wine of the eucharist were not physically transformed into flesh and blood; that the last judgement would be executed by God and not by Jesus; that the images and the cross were idols and the veneration of saints and relics idolatry.