At about this time, Waldo began to preach and teach publicly about his ideas of living simple lives and about poverty. He taught that "No man can serve two masters, God and money", (see Gospel of Matthew 6:24) and strongly criticized things done by the Pope and things taught by the Roman Catholic Church. Some of the things taught by the Catholic Church that he criticized were purgatory and transubstantiation. He said that the Roman Catholic Church was the prostitute from the book of Revelation. By 1170, many people were following him. These people were called "the Poor of Lyon", "the Poor of Lombardy", or "the Poor of God" who would spread their teaching abroad while dressed up as peddlers. Often called the Waldensians (or Waldenses), they were different from the Albigensians or Cathari.