Isaias 58:6

He says then to them again concerning these things, “Why do ye fast to Me as on this day, saith the Lord, that your voice should be heard with a cry? I have not chosen this fast, saith the Lord, that a man should humble his soul. Nor, though ye bend your neck like a ring, and put upon you sackcloth and ashes, will ye call it an acceptable fast.” To us He saith, “Behold, this is the fast that I have chosen, saith the Lord, not that a man should humble his soul, but that he should loose every band of iniquity, untie the fastenings of harsh agreements, restore to liberty them that are bruised, tear in pieces every unjust engagement, feed the hungry with thy bread, clothe the naked when thou seest him, bring the homeless into thy house, not despise the humble if thou behold him, and not [turn away] from the members of thine own family. …

And that this too may be clear to you, there were spoken from the person of the Father through Isaiah the prophet, the following words: “The ox knoweth his owner, and the ass his master’s crib; but Israel doth not know, and My people hath not understood. Woe, sinful nation, a people full of sins, a wicked seed, children that are transgressors, ye have forsaken the Lord.” And again elsewhere, when the same prophet speaks in like manner from the person of the Father, “What is the house that ye will build for Me? saith the Lord. …

“Learn, therefore, to keep the true fast of God, as Isaiah says, that you may please God. Isaiah has cried thus: ‘Shout vehemently, and do not spare: lift up thy voice as with a trumpet, and show My people their transgressions, and the house of Jacob their sins. They seek Me from day to day, and desire to know My ways, as a nation that did righteousness, and forsook not the judgment of God. They ask of Me now righteous judgment, and desire to draw near to God, saying, Wherefore have we fasted, and Thou seest not? and afflicted our souls, and Thou hast not known? Because in the days of your fasting you find your own pleasure, and oppress all those who are subject to you. Behold, ye fast for strifes and debates, and smite the humble with your fists. …

Moreover, concerning the righteousness which the law enjoined, confirmatory utterances are found both with the prophets and in the Gospels, because they all spoke inspired by one Spirit of God. Isaiah accordingly spoke thus: “Put away the evil of your doings from your souls; learn to do well, seek judgment, relieve the oppressed, judge the fatherless, plead for the widow.” And again the same prophet said: “Loose every band of wickedness, dissolve every oppressive contract, let the oppressed go free, and tear up every unrighteous bond. Deal out thy bread to the hungry, and bring the houseless poor to thy home. When thou seest the naked, cover him, and hide not thyself from thine own flesh. …

But it is clear to every one that piety, which teaches to worship and honour, is the highest and oldest cause; and the law itself exhibits justice, and teaches wisdom, by abstinence from sensible images, and by inviting to the Maker and Father of the universe. And from this sentiment, as from a fountain, all intelligence increases. “For the sacrifices of the wicked are abomination to the Lord ; but the prayers of the upright are acceptable before Him,” since “righteousness is more acceptable before God than sacrifice.” Such also as the following we find in Isaiah: “To what purpose to me is the multitude of your sacrifices? saith the Lord ;” and the whole section. …

But even in the common transactions of life, and of human intercourse at home and in public, even to the care of the smallest vessels, He in every possible manner made distinct arrangement; in order that, when they everywhere encountered these legal instructions, they might not be at any moment out of the sight of God. For what could better tend to make a man happy, than having “his delight in the law of the Lord?” “In that law would he meditate day and night.” It was not in severity that its Author promulgated this law, but in the interest of the highest benevolence, which rather aimed at subduing the nation’s hardness of heart, and by laborious services hewing out a fealty which was (as yet) untried in obedience: for I purposely abstain from touching on the mysterious senses of the law, considered in its spiritual and prophetic relation, and as abounding in types of almost every variet …

“Salvation comes to the house” of Zac chæus even. For what reason? Was it because he also believed that Christ came by Marcion? But the blind man’s cry was still sounding in the ears of all: “Jesus, Thou Son of David, have mercy on me.” And “all the people gave praise unto God”, not Marcion’s, but David’s. Now, although Zacchæus was probably a Gentile, he yet from his intercourse with Jews had obtained a smattering of their Scriptures, and, more than this, had, without knowing it, fulfilled the precepts of Isaiah: “Deal thy bread,” said the prophet, “to the hungry, and bring the poor that are cast out into thine house.” This he did in the best possible way, by receiving the Lord, and entertaining Him in his house. “When thou seest the naked cover him.” This he promised to do, in an equally satisfactory way, when he offered the half of his goods for all works of mercy. …

For, so far as pertains to fasts, they oppose to us the definite days appointed by God: as when, in Leviticus, the Lord enjoins upon Moses the tenth day of the seventh month (as) a day of atonement, saying, “Holy shall be to you the day, and ye shall vex your souls; and every soul which shall not have been vexed in that day shall be exterminated from his people.” At all events, in the Gospel they think that those days were definitely appointed for fasts in which “the Bridegroom was taken away;” and that these are now the only legitimate days for Christian fasts, the legal and prophetical antiquities having been abolished: for wherever it suits their wishes, they recognise what is the meaning of “the Law and the prophets until John.” Accordingly, (they think) that, with regard to the future, fasting was to be indifferently observed, by the New Discipline, of choice, not of command, accord …

33. Those prayers quickly ascend to God which the merits of our labours urge upon God. Thus also Raphael the angel was a witness to the constant prayer and the constant good works of Tobias, saying, “It is honourable to reveal and confess the works of God. For when thou didst pray, and Sarah, I did bring the remembrance of your prayers before the holiness of God. And when thou didst bury the dead in simplicity, and because thou didst not delay to rise up and to leave thy dinner, but didst go out and cover the dead, I was sent to prove thee; and again God has sent me to heal thee, and Sarah thy daughter-in-law. …

4. Finally, beloved brethren, the divine admonition in the Scriptures, as well old as new, has never failed, has never been silent in urging God’s people always and everywhere to works of mercy; and in the strain and exhortation of the Holy Spirit, every one who is instructed into the hope of the heavenly kingdom is com manded to give alms. God commands and prescribes to Isaiah: “Cry,” says He, “with strength, and spare not. Lift up thy voice as a trumpet, and declare to my people their transgressions, and to the house of Jacob their sins.” And when He had commanded their sins to be charged upon them, and with the full force of His indignation had set forth their iniquities, and had said, that not even though they should use supplications, and prayers, and fastings, should they be able to make atonement for their sins; nor, if they were clothed in sackcloth and ashes, be able to soften G …

In Isaiah: “Cry aloud,” saith He, “and spare not; lift up thy voice like a trumpet; tell my people their sins, and the house of Jacob their wickednesses. They seek me from day to day, and desire to know my ways, as a people which did righteousness, and did not forsake the judgment of God. They ask of me now a righteous judgment, and desire to approach to God, saying, What! because we have fasted, and Thou hast not seen: we have humiliated our souls, and Thou hast not known. For in the days of fasting are found your own wills; for either ye torment those who are subjected to you, or ye fast for strifes and judgments, or ye strike your neighbours with fists. For what do you fast unto me, that to-day your voice should be heard in clamour? This fast I have not chosen, save that a man should humble his soul. …

On account of this relationship of brotherhood, God teaches us never to do evil, but always good. And He also prescribes in what this doing good consists: in affording aid to those who are oppressed and in difficulty, and in bestowing food on those who are destitute. For God, since He is kind, wished us to be a social animal. Therefore, in the case of other men, we ought to think of ourselves. We do not deserve to be set free in our own dangers, if we do not succour others; we do not deserve assistance, if we refuse to render it. There are no precepts of philosophers to this purport, inasmuch as they, being captivated by the appearance of false virtue, have taken away mercy from man, and while they wish to heal, have corrupted. …