394. Now as this was foreseen, and was provided, lest the human race should perish in eternal death, it is here declared that none should do violence to Cain, by whom is signified faith separated from charity; and further that a mark was set upon him, which means that the Lord distinguished faith in a particular manner, in order to secure its preservation. These are arcana hitherto undiscovered, and are referred to by the Lord in what He said respecting marriage, and eunuchs, in Matthew:

There are eunuchs who were so born from their mother’s womb; and there are eunuchs who were made eunuchs of men; and there are eunuchs who have made themselves eunuchs for the kingdom of God’s sake; he that is able to receive it let him receive it (Matthew 19:12).

Those in the heavenly marriage are called “eunuchs;” those so “born from the womb” are such as resemble the celestial angels; those “made of men” are such as are like the spiritual angels; and those “made so by themselves” are like angelic spirits, who act not so much from charity as from obedience.