Parallel instances occur of the operation of this principle in the history of the Church, from the time that the Apostles were taken from it. St. Paul denounces distinctions in meat and drink, the observance of Sabbaths and holydays, and of ordinances, and the worship of Angels; yet Christians, from the first, were rigid in their stated fastings, venerated, as St. Justin tells us, the Angelic intelligences,[369:1] and established the observance of the Lord's day as soon as persecution ceased. 3. In like manner Celsus objects that Christians did not "endure the sight of temples, altars, and statues;" Porphyry, that "they blame the rites of worship, victims, and frankincense;" the heathen disputant in Minucius asks, "Why have Christians no altars, no temples, no conspicuous images?" and "no sacrifices;" and yet it is plain from Tertullian that Christians had altars of their own, and sacrifices and priests. And that they had churches is again and again proved by Eusebius who had seen "the houses of prayer levelled" in the Dioclesian persecution; from the history too of St. Gregory Thaumaturgus, nay from Clement.[370:1] Again, St. Justin and Minucius speak of the form of the Cross in terms of reverence, quite inconsistent with the doctrine that external emblems of religion may not be venerated. Tertullian speaks of Christians signing themselves with it whatever they set about, whether they walk, eat, or lie down to sleep. In Eusebius's life of Constantine, the figure of the Cross holds a most conspicuous place; the Emperor sees it in the sky and is converted; he places it upon his standards; he inserts it into his own hand when he puts up his statue; wherever the Cross is displayed in his battles, he conquers; he appoints fifty men to carry it; he engraves it on his soldiers' arms; and Licinius dreads its power. Shortly after, Julian plainly accuses Christians of worshipping the wood of the Cross, though they refused to worship the _ancile_. In a later age the worship of images was introduced.[370:2] 4.