Isaiah 58:8

The light is desirable, but more desirable still is the dawn that appears after the night. This he has called "the morning light." … Aquila has, "Then your light will break through like the dawn." For just as the dawn tears away the curtain of the night, so, he says, the night of your misfortunes, your life lived under the law, will disperse, and the light of my providence will be supplied to you.… "Your righteousness will go out before you, and the glory of the Lord will surround you." He makes it clear that the divine works follow our works. For with our righteousness in the vanguard, the glory of the Lord of the universe is given access, shining on us as we look for it.

This oracle has great force. For it does not simply say, "Light will be given to you by God," but it will be like lightning whose course and progress is sent by God, through which is clearly shown the desire of those who pray. By saying "first light," it instructs us that it will appear before time. For God, the guardian of all things, knew, as the giver of spiritual gifts, the time suited to each person for his blessings. But if anyone is fair and good and also caring and benevolent—to that person a reward will be given as a "first thing," so that in him there will arise just like an ear of corn his health (that is, the departing of all infirmities and the returning of good health). For the one who is free of diseases is fruitful in all ways, with an easy and cheerful production of good things. So the light of the divine understanding and our healthiness both arise within us, as God removes the burden of all sickness and also sets in us in its place the will to do good works and to abound in righteousness.

(Verse 8.) Then your light shall break forth like the dawn, and your healing shall spring up quickly; your righteousness shall go before you, and the glory of the Lord shall be your rear guard. LXX: Then your light shall break forth like the morning; your healing shall spring forth speedily, and your righteousness shall go before you; the glory of God shall surround you. When you have not done those things that the previous conversation narrated, and you have done those things that we are now speaking about, then your fasting will be acceptable, and your morning light will break forth; the sun of righteousness, about which Malachi the prophet speaks in the person of God the Father, saying: For you who fear my name, the sun of righteousness will rise, with healing in its wings (Malachi 4:2). That sun is called the light here. For just as the morning light dispels darkness, so the light of knowledge and truth dispels all errors. And your healings, it is said, will quickly arise. For this reason, Aquila, expressing word for word, put: And the scar of your wound will quickly be covered; so that, namely, the wounds of our sins may be closed with a quickly covered scar at the rising of the sun of righteousness. Because of this, the Seventy translated τὰ ἰάματά σου, that is, your healings, with the similarity of the word ἱμάτια, that is, garments. Therefore, deceived by the falseness of many translations, they use this testimony to prove the resurrection of the body, namely that the garment of the soul will receive a body, which will arise on the day of resurrection. And it says, 'Your righteousness will go before you.' (Genesis 30:33, according to the Septuagint). According to what Jacob says: 'Tomorrow my righteousness will answer me,' and what is written will be fulfilled: 'Behold, the man and his works.' And the glory of the Lord will surround you, like a beautiful garment, so that you may be glorified before God and before men.…