II. In all occasions of danger and distress, it was the practice of the primitive Christians to fortify their minds and bodies by the sign of the cross, which they used, in all their ecclesiastical rites, in all the daily occurrences of life, as an infallible preservative against every species of spiritual or temporal evil. 39 The authority of the church might alone have had sufficient weight to justify the devotion of Constantine, who in the same prudent and gradual progress acknowledged the truth, and assumed the symbol, of Christianity. But the testimony of a contemporary writer, who in a formal treatise has avenged the cause of religion, bestows on the piety of the emperor a more awful and sublime character. He affirms, with the most perfect confidence, that in the night which preceded the last battle against Maxentius, Constantine was admonished in a dream 39a to inscribe the shields of his soldiers with the _celestial sign of God_, the sacred monogram of the name of Christ; that he executed the commands of Heaven, and that his valor and obedience were rewarded by the decisive victory of the Milvian Bridge. Some considerations might perhaps incline a sceptical mind to suspect the judgment or the veracity of the rhetorician, whose pen, either from zeal or interest, was devoted to the cause of the prevailing faction. 40 He appears to have published his deaths of the persecutors at Nicomedia about three years after the Roman victory; but the interval of a thousand miles, and a thousand days, will allow an ample latitude for the invention of declaimers, the credulity of party, and the tacit approbation of the emperor himself who might listen without indignation to a marvellous tale, which exalted his fame, and promoted his designs. In favor of Licinius, who still dissembled his animosity to the Christians, the same author has provided a similar vision, of a form of prayer, which was communicated by an angel, and repeated by the whole army before they engaged the legions of the tyrant Maximin. The frequent repetition of miracles serves to provoke, where it does not subdue, the reason of mankind; 41 but if the dream of Constantine is separately considered, it may be naturally explained either by the policy or the enthusiasm of the emperor. Whilst his anxiety for the approaching day, which must decide the fate of the empire, was suspended by a short and interrupted slumber, the venerable form of Christ, and the well-known symbol of his religion, might forcibly offer themselves to the active fancy of a prince who reverenced the name, and had perhaps secretly implored the power, of the God of the Christians. As readily might a consummate statesman indulge himself in the use of one of those military stratagems, one of those pious frauds, which Philip and Sertorius had employed with such art and effect. 42 The præternatural origin of dreams was universally admitted by the nations of antiquity, and a