180. The words spoken to Cain, "Cursed art thou," are few, but nevertheless entitled to a great deal of attention, in that they are equal to the declaration: Thou art not the one from whom the blessed seed is hoped for. With this word Cain stands cast out and cut off like a branch from the root, unable longer to hope for the distinction around which he had circled. It is a fact, that Cain craved the distinction of passing on the blessing; but the more closely he encircled it the more elusive it became. Such is the lot of all evildoers: their failure is commensurate with their efforts to succeed.
181. From this occurrence originate the two churches which are at war with each other: the one of Adam and the righteous, which has the hope and promise of the blessed seed; the other of Cain, which has forfeited this hope and promise through sin, without ever being able to regain it. For in the flood Cain's whole posterity became extinct, so that there has been no prophet, no saint, no prince of the true Church who could trace his lineage back to Cain. All that was denied Cain and withdrawn from him, when he was told: "Cursed art thou."
182. We find added, however, the words, "from the ground." These words qualify the fearful wrath. For, if God had said, "from the heavens," he would have deprived his posterity forever of the hope of salvation. As it is, the words, "from the ground," convey, indeed, the menacing decision that the promise of the seed has been forfeited, but the possibility is left that descendants of Cain as individuals, prompted by the Holy Spirit, may join themselves to Adam and find salvation.
This, in after ages, really came to pass. While it is true the promise of the blessed seed was a distinction confined to the Jews, according to the statement in Psalm 147, 20: "He hath not dealt so with any nation," the Gentiles, nevertheless, retained the privilege of beggars, so to speak. It was in this manner that the Gentiles, through divine mercy, obtained the same blessing the Jews possessed on the ground of the divine faithfulness and promise.
183. In like manner, all rule in the Church was absolutely denied also to the Moabites and Amorites; and yet many private individuals among them embraced the religion of the Jews. Thus, every right in the Church was taken away from Cain and his posterity absolutely, yet permission was left them to beg, as it were, for grace. That was not taken from them. Cain, because of his sin, was cast out from the right of sitting at the family table of Adam. But the right was left him to gather up, doglike, the crumbs that fell from his father's table, Mt 15, 26-27. This is signified by the Hebrew expression min haadama, "From the ground."
184. I make these observations because there is a great probability that many of the posterity of Cain joined themselves to the holy patriarchs. But their privileges were not those of an obligatory service toward them on the part of the Church, but mere toleration of them as individuals who had lost the promise that the blessed seed was to spring from their flesh and blood. To forfeit the promise was no trifle; still, even that curse was so mitigated as to secure for them the privilege of beggars, so that heaven was not absolutely denied them, provided they allied themselves with the true Church.