Augustine of Hippo : [The pagans say:] "They find fault with the sacred ceremonies, the sacrificial victims, the burning of incense, and all the other parts of worship in our temples; and yet the same kind of worship had its origin in antiquity with themselves, or from the God whom they worship, for He is represented by them as having been in need of the first-fruits." This question is obviously founded upon the passage in our Scriptures in which it is written that Cain brought to God a gift from the fruits of the earth, but Abel brought a gift from the firstlings of the flock. Our reply, therefore, is, that from this passage the more suitable inference to be drawn is, how ancient is the ordinance of sacrifice which the infallible and sacred writings declare to be due to no other than to the one true God; not because God needs our offerings, seeing that, in the same Scriptures, it is most clearly written, "I said unto the Lord, Thou art my Lord, for Thou hast no need of my good," but because, even in the acceptance or rejection or appropriation of these offerings, He considers the advantage of men, and of them alone. For in worshipping God we do good to ourselves, not to Him. — Letters 102.3 Bede : It came to pass after many days that Cain brought an offering to the Lord of the fruit of the ground: Abel also brought of the firstlings of his flock and of the fat thereof. It is clearly shown that both brothers had faith in God, both either naturally admonished or taught by their parents, knew that gifts should be offered to God, and that the guilt of their father's transgression should be washed away by sacrifices offered to Him: but because they did not offer with an equal mind, their offerings were not equally accepted. For I do not think that Cain sinned in that he either worked the work of a farmer or offered gifts to God from the fruits of the ground, but that he worked with less perfect piety in the care of the flesh, and approached the offering of gifts to God with less perfect devotion. Finally, Noah, a farmer, also worked the land and planted a vineyard: and Melchizedek, the priest of the Most High God, offered bread and wine from the fruits of the land. Therefore, Cain was not rejected because of the kind of offering. He indeed offered to God from what he himself was accustomed to live by; but he was rejected along with his gifts by Him who looks into the hearts, because of the impious mind of the offerer, as the following words show when it is said: — Commentary on Genesis (Hexaemeron) Bede : For Cain offered gifts to the Lord from the fruits of the earth. For that people believed they pleased the Lord through good works, which they pursued for the sake of earthly reward. Or certainly, they offered gifts from the fruits of the earth when that people believed themselves to be justified through earthly circumcision, earthly Sabbath, earthly unleavened bread, and earthly Passover, despising the righteousness of faith which is in Christ. — Commentary on Genesis (Hexaemeron) Clement of Rome : 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] — Clement's First Letter to the Corinthians, Chapters 3-4 Ephrem the Syrian : Abel was very discerning in his choice of offerings, whereas Cain showed no such discernment. Abel selected and offered the choicest of his firstborn and of his fat ones, while Cain either offered young grains or certain fruits that are found at the same time as the young grains. Even if his offering had been smaller than that of his brother, it would have been as acceptable as the offering of his brother, had he not brought it with such carelessness. They made their offerings alternately; one offered a lamb of his flock, the other the fruits of the earth. But because Cain had taken such little regard for the first offering that he offered, God refused to accept it in order to teach Cain how he was to make an offering. — COMMENTARY ON Genesis 3.2.1 John Chrysostom : Consider how the Lord of nature added knowledge to conscience. After all, who brought this to our understanding? It was none other than knowledge associated with conscience. The text says, "He brought an offering of the fruits of the earth to the Lord." He knew and understood that he should offer from his own possessions some produce to God as to his master. not because God needs them, but for the purpose of demonstrating his gratitude as being himself a beneficiary of such kindness. God, you see, is proof against need, and depends on nothing we have to offer; but in his ineffable love he shows considerateness for us, and for the sake of our salvation he allows these things to happen so that knowledge of the Lord may be for the human race a school of virtue. Philo of Alexandria : (60) Why Cain after some days offers up the first-fruits of his fruits, but when it is said that "Abel offered up first-fruits of the first-born of his flock and of the fat," "after some days" is not added? (#Genesis 4:3-4). Moses here intimates the difference between a lover of himself, and one who is thoroughly devoted to God; for the one took to himself the first-fruits of his fruits, and very impiously looked upon God as worthy only of the secondary and inferior offerings; for the expression, "after some days," implies that he did not do so immediately; and when it is said that he offered of the fruits, that intimates that he did not offer of the best fruits which he had, and herein displays his iniquity. But the other, without any delay, offered up the first-born and eldest of all his flocks, in order that in this the Father might not be treated unworthily. — QUESTIONS AND ANSWERS ON GENESIS, I