Here, assembled for the first time in one volume, are the main pronouncements of the Popes on the moral law as interpreted to the Church in the letters called papal encyclicals. Describing the times and conditions prompting each letter in its historical sequence, this unique volume contains the rulings of the Popes on such vital matters as spiritual and temporal authority, the Sacraments, the position of the Church in regard to communism, fascism, labor, and many other questions which have vexed man in the past and present.