The subject in this chapter is the first rational with the Lord which was conceived from the influx of the Internal Man into the External Man's affection for knowledge. The Internal Man is Abram, while the External Man's affection for knowledge is Hagar the Egyptian servant-girl; and the rational born from these two is Ishmael. The nature of this rational is described, and further on, in Chapter 21, it is said that it was 'driven out of the house' after the Lord's Divine Rational represented by Isaac had been born.