John Chrysostom : What will you say, Daniel? You are among the good; you enjoy honor before God and people; why do you concern yourself with the others? But Moses also acted the same way. And what does he say? "He asked for the things that were due with fasting, sackcloth and ashes." Why did he do that, if what he was asking was due the Israelites? He did it so that he might not make them unworthy of this. For there is no compulsion that can be applied to God; he is above all laws. He did this "to seek in prayer and petition." — COMMENTARY ON Daniel 9 Tertullian : Nor is it merely a change of nature, or aversion of perils or obliteration of sins but likewise the recognition of mysteries that fasts will merit from God. Look at Daniel's example.… In the first year of King Darius, when, after careful and repeated meditation on the times predicted by Jeremiah, he set his face to God in fasts and sackcloth and ashes. An angel was sent to him and immediately stated this had been the cause of the divine honor; he said, "I came to show you, wretched as you are," namely, because he had been fasting. — ON FASTING 7