How are you fallen from heaven, O Lucifer, son of the morning! how are you cut down to the ground, who did weaken the nations!
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Augustine of Hippo
For example, what is said in Isaiah, “How he is fallen from heaven, Lucifer, son of the morning!” and the other statements in that context that speak of the king of Babylon are of course to be understood of the devil. However, the statement that is made in the same place, “He that sent orders to all nations is crushed on the earth,” does not altogether fitly apply to the head himself. - "Christian Instruction 3.37"
It was by a kind of strength that man offended, so as to require to be corrected by weakness: for it was by a certain “pride” that he offended; so as to require to be chastened by humility. All proud persons call themselves strong people. Therefore have many [others] “come from the East and the West” and have attained “to sit down with Abraham, and Isaac and Jacob, in the kingdom of heaven.” Therefore, how was it that they so attained? Because they would not be strong. What is meant by “would not be strong”? They were afraid to presume of their own merits. They did not “go about to establish their own righteousness,” that they might “submit themselves to the righteousness of God.” … Behold! you are mortal; and you bear about you a body of flesh that is corrupting away: “And you shall fall like one of the princes. You shall die like human beings” and shall fall like the devil. What good does the remedial discipline of mortality do you? The devil is proud, as not having a mortal body, as...
The Word clearly demonstrates many things in this passage: the lunacy of that spirit, his fall from what was good to what was bad, and the result of his fall. Having pronounced many terrible threats against humanity he realized that they had the possibility of falling into evil by virtue of their own free will. Therefore he turned them from a good state to a bad one, leading the many souls by the lure of desire to every fashion of evil. There was no device he did not attempt. With the myths of the gods and impure stories he tempted his victims with the things they loved and the things that gave them pleasure.… Soon, according to the blessed apostle, they no longer pondered the works of God that still illumined the heavens. - "Proof of the Gospel 4.9"
O Lucifer. O day-star. All this, according to the letter, is spoken of the king of Babylon. It may also be applied, in a spiritual sense, to Lucifer, the prince of devils, who was created a bright angel, but fell by pride and rebellion against God. (Challoner) (Luke x. 18.) (Calmet)
He fell by pride, as Nabuchodonosor did. (Worthington)
Homer (Iliad xix.) represents the demon of discord hurled down by Jupiter to the miserable region of mortals.
Lucifer fell, Lucifer who used to rise at dawn; and he who was raised in a paradise of delight had the well-earned sentence passed upon him: “Though you exalt yourself as the eagle, and though you set your nest among the stars, thence will I bring you down, says the Lord.” For he had said in his heart, “I will exalt my throne above the stars of God,” and “I will be like the Most High.” - "Letter 22.4"
For greater ease of understanding we translated this phrase as follows: “How you have fallen from heaven, Lucifer, who arose in the morning.” But if we were to render a literal translation from the Hebrew, it would read, “How you have fallen from heaven, howling son of the dawn.” Lucifer is also signified with other words. And he who was formerly so glorious that he was compared to a bearer of lightning is now told that he must weep and mourn. Just as Lucifer scatters the darkness, it says, glowing and shining with a golden hue, so also your stepping forth to the peoples and the public seemed like a shining star. But you who spoke with arrogance, who wounded the nations, fell to the earth. I have obtained so great a power that heaven should stand still for me, and the stars above deserve to be thrown under my feet. Nevertheless, the Jews wanted to be understood as the heaven and stars of God, inasmuch as it continues, “I will sit in the mount of the covenant,” that is, in the temple wh...