All Christians, whether Greek, Syrian, Roman, or Egyptian, were considered as half Jewish. This was another reason for concealing their books from the Gentiles, that they might remain united and impenetrable. Their secret was more inviolably kept than that of the mysteries of Isis or of Ceres; they were a republic apart--a state within the state. They had no temples, no altars, no sacrifice, no public ceremony. They elected their secret superiors by a majority of voices. These superiors, under the title of ancients, priests, bishops, or deacons, managed the common purse, took care of the sick and pacified quarrels. Among them it was a shame and a crime to plead before the tribunals or to enlist in the armed force; and for a hundred years there was not a single Christian in the armies of the empire. Thus, retired in the midst of the world and unknown even when they appeared, they escaped the tyranny of the proconsuls and prætors and were free amid the public slavery. It is not known who wrote the famous book entitled "_Τῶν Ἀποστόλων Διδαχαί_" (the Apostolical Constitutions), as it is unknown who were the authors of the fifty rejected gospels, of the Acts of St. Peter, of the Testament of the Twelve Patriarchs, and of so many other writings of the first Christians; but it is likely that the "Constitutions" are of the second century. Though falsely attributed to the apostles, they are very valuable. They show us what were the duties of a bishop chosen by the Christians, how they were to reverence him, and what tribute they were to pay him. The bishop could have but one wife, who was to take good care of his household: "_Μιᾶς ἂνδρα γεγενόμενον γυναικὸς μονογάμου κάλόν τοῦ ὶδίου προεστότα_." Rich Christians were exhorted to adopt the children of poor ones. Collections were made for the widows and orphans; but the money of sinners was rejected; and, nominally, an innkeeper was not permitted to give his mite. It is said that they were regarded as cheats; for which reason very few tavern-keepers were Christians. This also prevented the Christians from frequenting the taverns; thus completing their separation from the society of the Gentiles. The dignity of deaconess being attainable by the women, they were the more attached to the Christian fraternity. They were consecrated; the bishop anointing them on the forehead, as of old the Jewish kings were anointed. By how many indissoluble ties were the Christians bound together! The persecutions, which were never more than transitory, did but serve to redouble their zeal and inflame their fervor; so that, under Diocletian, one-third of the empire was Christian. Such were a few of the human causes that contributed to the progress of Christianity. If to these we add the divine causes, which are to the former as infinity to unity, there is only one thing which can surprise us; that a religion so true did not at once extend itself over the two hemispheres, not excepting the most savage islet.