It is not the purpose of this narrator to write the history of the world. It is not his purpose to write even the history of mankind. His object is to write the history of redemption. Starting from the broad fact of man's alienation from God, he means to trace that element in human history which results in the perfect re-union of God and man. The key-note has been struck in the promise already given that the seed of the woman should prevail over the seed of the serpent, that the effects of man's voluntary dissociation from God should be removed. It is the fulfilment of this promise which is traced by this writer. He steadily pursues that one line of history which runs directly towards this fulfilment; turning aside now and again to pursue, to a greater or less distance, diverging lines, but always returning to the grand highway on which the promise travels. His method is first to dispose of collateral matter and then to proceed with his main theme. As here, he first disposes of the line of Cain and then returns to Seth through whom the line of promise is maintained. The first thing we have to do with outside the garden is death--the curse of sin speedily manifests itself in its most terrible form. But the sinner executes it himself. The first death is a murder. As if to show that all death is a wrong inflicted on us and proceeds not from God but from sin, it is inflicted by sin and by the hand of man. Man becomes his own executioner, and takes part with Satan, the murderer from the beginning. But certainly the first feeling produced by these events must have been one of bitter disappointment, as if the promise were to be lost in the curse. The story of Cain and Abel was to all appearance told in order to point out that from the very first men have been divided into two great classes, viewed in connection with God's promise and presence in the world. Always there have been those who believed in God's love and waited for it, and those who believed more in their own force and energy. Always there have been the humble and self-diffident who hoped in God, and the proud and self-reliant who felt themselves equal to all the occasions of life. And this story of Cain and Abel and the succeeding generations does not conceal the fact, that for the purposes of this world there has been visible an element of weakness in the godly line, and that it is to the self-reliant and God-defying energy of the descendants of Cain that we owe much of the external civilisation of the world. While the descendants of Seth pass away and leave only this record, that they "walked with God," there are found among Cain's descendants, builders of cities, inventors of tools and weapons, music and poetry and the beginnings of culture.