perform what is good not by constraint or necessity. Such is the difference in the churches on the subject of fasts. Nor is there less variation in regard to religious assemblies.1 For although almost all churches throughout the world celebrate the sacred mysteries on the sabbath2 of every week, yet the Christians of Alexandria and at Rome, on account of some ancient tradition, have ceased to do this. The Egyptians in the neighborhood of Alexandria, and the inhabitants of Thebaïs, hold their religious