But by the envy of the devil, death came into the world:

“Every kind of honour and happiness was bestowed upon you, and then was fulfilled that which is written, "My beloved ate and drank, and was enlarged and became fat, and kicked." [Deuteronomy 32:15] Hence flowed emulation and envy, strife and sedition, persecution and disorder, war and captivity. So the worthless rose up against the honoured, those of no reputation against such as were renowned, the foolish against the wise, the young against those advanced in years. For this reason righteousness and peace are now far departed from you, inasmuch as every one abandons the fear of God, and has become blind in His faith, neither walks in the ordinances of His appointment, nor acts a part becoming a Christian, but walks after his own wicked lusts, resuming the practice of an unrighteous and ungodly envy, by which death itself entered into the world. [Wisdom 2:24] For thus it is written: "And it came to pass after certain days, that Cain brought of the fruits of the earth a sacrifice unto God; and Abel also brought of the firstlings of his sheep, and of the fat thereof. And God had respect to Abel and to his offerings, but Cain and his sacrifices He did not regard. And Cain was deeply grieved, and his countenance fell. And God said to Cain, Why are you grieved, and why is your countenance fallen? If you offer rightly, but do not divide rightly, have you not sinned? Be at peace: your offering returns to yourself, and you shall again possess it. And Cain said to Abel his brother, Let us go into the field. And it came to pass, while they were in the field, that Cain rose up against Abel his brother, and slew him." [Genesis 4:3-8] You see, brethren, how envy and jealousy led to the murder of a brother. Through envy, also, our father Jacob fled from the face of Esau his brother [Genesis 27:41-45]. Envy made Joseph be persecuted unto death, and to come into bondage. [Genesis 37:18-28] Envy compelled Moses to flee from the face of Pharaoh king of Egypt, when he heard these words from his fellow-countryman, "Who made you a judge or a ruler over us? Will you kill me, as you killed the Egyptian yesterday?" [Exodus 2:14] On account of envy, Aaron and Miriam had to make their abode without the camp. [Numbers 12:14-15] Envy brought down Dathan and Abiram alive to Hades, through the sedition which they excited against God's servant Moses. [Numbers 16:33] Through envy, David not only underwent the hatred of foreigners, but was also persecuted by Saul king of Israel. [1 Samuel 21:10-15]”

“The devil, seeing that human beings were made in the image of God, fell through malicious envy into jealousy and, compelled by this envy, caused another to be lost, not hurling down another by the instinct of his jealousy before he himself was hurled down by his own jealousy. He was made a prisoner before he imprisoned another. He was lost before he caused another to be lost, when, compelled by envy, he took from human beings the grace of immortality that had been given to them. He himself had in fact first lost what he once was. Beloved brothers, how great is the evil into which the angel fell by which that sublime and splendid nobility was deceived and subverted, by which the deceiver himself was deceived! From then on envy raged throughout the earth, since the one who will perish through the devil's spite pays homage to the master of perdition, and the one who is jealous imitates the devil, as it is written, "Death entered the world through the envy of the devil." Consequently, "those who belong to his party imitate him."”

“Christ descended and died and by his death freed us from death. Dying, he destroyed death. And you, brothers, know that death entered the world through the envy of the devil. Scripture says that "God did not make death, nor does he rejoice in the death of the living. He created all things that they might exist. But, by the devil's envy, death entered the world." Human beings would not have died at the hands of the devil, had it been a matter of being compelled by force. The devil did not have the power to force them, only the shrewdness to seduce them. Without your consent the devil would have remained impotent. It was your consent, O man, that led you to death. Born mortal from a mortal, we became mortal from the immortals that we were. By their origin in Adam all human beings are mortal. But Jesus, the Son of God, the Word of God through whom all things were made, the only-begotten Son, equal to the Father, became mortal. "The Word became flesh and dwelled among us."”

“We must be convinced that the evil of envy is healed with more difficulty than the other vices. In fact, I would dare to say that if someone allows himself to be taken in only once by the plague of that poison, he will be without remedy. Envy is the scourge of which the prophet said figuratively, "See, I will send you poisonous snakes, against which no charm will work, and they will bite you." Rightly, therefore, the bite of envy was compared by the prophet with the fatal poison of the basilisk, from the effect of which the author and initiator of all poisons himself perished and caused others to perish. In fact, even before he poured forth the poison of death on the man, whom he envied, that murderer had already ruined himself. Indeed, "death entered the world through the devil's envy, and those who belong to him experience it." Just as he who was first corrupted by the plague of that same evil was unable to accept the remedy of penitence and the provision for the cure, so also those who offer themselves to be struck by the same poisonous bites preclude any help from the divine enchanter.”

“For it is written of him: But by the envy of the Devil, death entered into the world (Wis. 2:24). Because he himself lost heaven, he envied the man who was created, and, ruined, he increased his own damnation by ruining others. The envious must be admonished to recognize the many falls to which the growing ruin subjects them, because, while they do not cast envy out of their hearts, they are led into open wickedness of deeds. For if Cain had not envied his brother's accepted offering, he would not have come to extinguish his life. Therefore it is written: And the Lord looked upon Abel and his gifts; but to Cain and his gifts He did not look. And Cain was very angry, and his face fell (Gen. 4:4).”

“Envy. Lucifer thought that the honour of the hypostatic union (Calmet) belonged to the angelical, rather than to the human nature; and this he was guilty of envy, (Haydock) and strove to become like the most High, Isaias xiv. 14. (St. Bernard, ser. xvii. in Canticle of Canticles) (Cornelius a Lapide, &c.) Bible Text & Cross-references: The vain reasonings of the wicked: their persecuting the just, especially the Son of God. 1 For they have said, reasoning with themselves, but not right: *The time of our life is short and tedious, and in the end of a man there is no remedy, and no man hath been known to have returned from hell: 2 For we are born of nothing, and after this we shall be as if we had not been: for the breath in our nostrils is smoke: and speech a spark to move our heart, 3 Which being put out, our body shall be ashes, and our spirit shall be poured abroad as soft air, and our life shall pass away as the trace of a cloud, and shall be dispersed as a mist, which is driven away by the beams of the sun, and overpowered with the heat thereof: 4 And our name in time shall be forgotten, and no man shall have any remembrance of our works. 5 *For our time is as the passing of a shadow, and there is no going back of our end: for it is fast sealed, and no man returneth: 6 *Come, therefore, and let us enjoy the good things that are present, and let us speedily use the creatures as in youth. 7 Let us fill ourselves with costly wine, and ointments: and let not the flower of the time pass by us. 8 Let us crown ourselves with roses, before they be withered: let no meadow escape our riot. 9 Let none of us go without his part in luxury: let us every where leave tokens of joy: for this is our portion, and this our lot. 10 Let us oppress the poor just man, and not spare the widow, nor honour the ancient grey hairs of the aged. 11 But let our strength be the law of justice: for that which is feeble is found to be nothing worth. 12 Let us, therefore, lie in wait for the just, because he is not for our turn, and he is contrary to our doings, and upbraideth us with transgressions of the law, and divulgeth against us the sins of our way of life. 13 *He boasteth that he hath the knowledge of God, and calleth himself the son of God. 14 *He is become a censurer of our thoughts. 15 He is grievous unto us, even to behold: for his life is not like other men’s, and his ways are very different. 16 We are esteemed by him as triflers, and he abstaineth from our ways as from filthiness, and he preferreth the latter end of the just, and glorieth that he hath God for his father. 17 Let us see then if his words be true, and let us prove what shall happen to him, and we shall know what his end shall be. 18 *For if he be the true son of God, he will defend him, and will deliver him from the hands of his enemies. 19 Let us examine him by outrages and tortures, that we may know his meekness, and try his patience. 20 *Let us condemn him to a most shameful death: for there shall be respect had unto him by his words. 21 These things they thought, and were deceived: for their own malice blinded them. 22 And they knew not the secrets of God, nor hoped for the wages of justice, nor esteemed the honour of holy souls. 23 *For God created man incorruptible, and to the image of his own likeness he made him. 24 *But by the envy of the devil, death came into the world: 25 And they follow him that are of his side.”