Didymus the Blind : According to the word of blessing to the one receiving illumination, "The Lord will be your everlasting light." … When this economy was reconstituted, God opened his eyes on the house of Judah, that is, the living church of God, with the Savior sent from the house of Judah to rule over it. — COMMENTARY ON Zechariah 4:200-201 Jerome : (Verse 19, 20.) The sun will no longer be your light by day, nor will the splendor of the moon shine on you; for the LORD will be your everlasting light, and your God will be your glory. Your sun will never set again, and your moon will not decrease; for the LORD will be your everlasting light, and the days of your mourning will be fulfilled. LXX: And there will be no more sun for you to shine by day, nor will the moon's light shine on you at night; but the LORD will be your everlasting light, and your God will be your glory. For the sun will not strike you by day, nor the moon by night. And the Lord will be an everlasting light, and your days of mourning will be ended. From this chapter, we are compelled to refer all that has been said and will be said, to the final time: when the sun and moon cease their function as they pass through heaven and earth. And the Lord Himself will be a perpetual light, so that what the carnal-minded assert to be fulfilled in a thousand years, we may believe will be fulfilled spiritually, in the quality of the promises, not differing in time. To these things it must be briefly answered that if the sun sets at noon for false prophets and sinners, and conversely, the sun of justice rises for those who fear the Lord: why then does the one who says, 'I am the light of the world' (John 8:12), who shines in the darkness, and the darkness has not comprehended him (John 1)? For indeed, the sun does not scorch us during the day, nor does the moon during the night (Psalms 121:6). Because we have the Lord as our perpetual light, and the days of our mourning will be fulfilled, not in the lamentation of the destruction of Jerusalem, but in the rejoicing of the instruction of the Church. Blessed are those who mourn, for they will be comforted. Blessed are those who weep, for they will laugh. Blessed are those who hunger and thirst for righteousness, for they will be satisfied (Matthew 5). After being satisfied with the flesh of the Lord, they will proclaim the word of the Lord and declare their works to the king (Psalms 44). — Commentary on Isaiah Origen of Alexandria : We must keep in mind, however, that the Word promises to the righteous through the mouth of Isaiah that days will come when not the sun but the Lord will be to them an everlasting light, and God will be their glory. And it is from misunderstanding, I think, some pestilent heresy that gave an interpretation to the words "let there be light," as if they were the expression of a wish merely on the part of the Creator, that Celsus made the remark, "The Creator did not borrow light from above, like those persons who kindle lamps at those of their neighbors." — AGAINST CELSUS 6:51 Theodoret of Cyrus : This is exactly what the future life possesses. It will need neither moon nor sun, since it has the ineffable light of God. But those who believe can take advantage of it in a provisional form. Nevertheless, in a figurative sense, believers enjoy this light even now. When they are illuminated by this light, they take the road that is free from error.… And this is what is announced about the life to come. It will have immutability of thought. It will be arrayed in righteousness forever. It will have freedom from sin. It will not have an excess of either youth or age. Instead, it will have a life without end. And in that life those who are worthy will inherit the land of the living. — COMMENTARY ON Isaiah 19:60.19