When Ambrose heard of this shocking affair, he was filled with grief and horror; for he had relied on the emperor's promise to spare the Thessalonians, and great care had been taken that he should not know anything of the orders which had been afterwards sent off. He wrote a letter to Theodosius, exhorting him to repent, and telling him that, unless he did so, he could not be admitted to the holy Communion. This letter brought the emperor to feel that he had done very wrongly; but Ambrose wished to make him feel it far more. As Theodosius was about to enter the cathedral, the bishop met him in the porch, and, laying hold on his robe, desired him to withdraw, because he was a man stained with innocent blood. The emperor said that he was deeply grieved for his offence; but Ambrose told him that this was not enough--that he must show some more public proofs of his repentance for so great a sin. The emperor withdrew accordingly to his palace, where he shut himself up for eight months, refusing to wear his imperial robes, and spending his time in sadness and penitence. At length, when Christmas was drawing near, he went to the bishop, and humbly begged that he might be admitted into the Church again. Ambrose desired him to give some substantial token of his sorrow, and the emperor agreed to make a law by which no sentence of death should be executed until thirty days after it had been passed. This law was meant to prevent any more such sad effects of sudden passion in princes as the massacre of Thessalonica. The emperor was then allowed to enter the church, where he fell down on the pavement, with every appearance of the deepest grief and humiliation; and it is said that from that time he never spent a day without remembering the crime into which his passion had betrayed him. Theodosius was the last emperor who kept up the ancient glory of Rome. He is called "the Great," and in many respects was well deserving of the name. He died in 395, and St. Ambrose died within two years after, on Easter eve, in the year 397. CHAPTER XVI. THE TEMPLE OF SERAPIS. A.D. 391. In the account of Constantine, it was mentioned that the emperors after their conversion did not try to put down heathenism by force, or all at once.[11] For the wise teachers of the Church knew that this would not be the right way of going to work, but that it would be more likely to make the heathens obstinate, than to convert them. Thus St. Augustine (of whom I shall have more to tell you by-and-by) says in one of his sermons--"We must first endeavour to break the idols in their hearts. When they themselves become Christians, they will either invite us to the good work of destroying their idols, or they will be beforehand with us in doing so. And in the mean while, we must pray for them, not be angry with them." [11] Page 39.