Augustine of Hippo : The reason for this break in the narrative [in the description of the genealogies to the flood] was, I take it, that the writer, as though bidden by God, was unwilling to have the beginning of world chronology reckoned from the earthly city (that is, from the generation of Cain), and so he deliberately went back to Adam for a new beginning. If we ask why this return to recapitulate was made immediately after mentioning Seth's son, the man who hoped to call upon the name of the Lord God, the answer must be that this was the proper way to present the two cities. The one begins and ends with a murderer, for Lamech, too, as he admitted to his two wives, was a murderer. The other city begins with the man who hoped to call upon the name of the Lord God, for the invocation of God is the whole and the highest preoccupation of the city of God during its pilgrimage in this world. It is symbolized in the one "man" (Enosh) born of the "resurrection" (Seth) of the man who was slain (Abel). That one man in fact is a symbol of the unity of the whole heavenly city, which is not yet in the fullness that it is destined to reach and which is adumbrated in this prophetic figure. — City of God 15.21 Bede : This is the book of the generation of Adam. In the day when God created man, He made him in the likeness of God: He created them male and female, and He blessed them. This is the book of the first creation of man, which God made in His likeness, that he might be perpetually good, immortal, and happy by participation in His goodness. God created them male and female and blessed them with the grace of His blessing. Such was the generation of Adam with his wife on the day he was created. But alas! how grievous! He defiled the likeness of God by believing the enemy rather than the Creator; his firstborn contracted the heavier punishment of a curse by envying and killing his brother; the seventh from him, Lamech, corrupted the established law of male and female, of which it was said, "They shall be two in one flesh" (Gen. II, 24), by taking two wives and uniting three in one flesh. As evils increased everywhere, humanity so departed from the likeness of its Creator and the first blessing that by the tenth generation, except for a few whom the ark held, it deserved to be entirely destroyed. However, the Creator Himself granted that we might return to that likeness and blessing, being born and dying in the likeness of our nature, so that redeemed through Him, we might merit to say of Him: "We know that when He appears, we shall be like Him, for we shall see Him as He is" (1 John III, 2), and to hear from Him: "Come, you blessed of My Father, inherit the kingdom prepared for you from the foundation of the world" (Matt. XXV, 34). — Commentary on Genesis (Hexaemeron) Cosmas Indicopleustes : This is the book of the generation of mankind. In the day that God created Adam, in the likeness of God made he him; male and female created he them. And he blessed them and called his name Adam in the day when he created them. And Adam lived 230 years and begat a son in his likeness and after his image, and called his name Sêth. In this place likewise he called his name Sêth, as being the foundation of the human race, and as bearing his own characteristics and the proper dignities. — The Christian Topography, Book 5 Cosmas Indicopleustes : Of these the first was Alorus, that is, Adam; the second Alaaprus, Seth; the third, Almêdôn, Enoch; the fourth, Ammeôn, Cainân: the fifth, Ammegalaros, Mahalaleel; the sixth, Daonus, a keeper of sheep, Jared; the seventh, Euedôrachos, Enoch; the eighth, Amempsinachus, Methuselah; the ninth, Otiortes, Lamech; the tenth, Xisuthrus, Noah. In his time they say the great flood recorded by Moses occurred. — The Christian Topography, Book 12