2093. 'Whom Sarah will bear to you' means Divine Truth joined to Divine Good from which it will come forth into being. This is clear from the representation of 'Sarah' as Divine Truth, dealt with already in 2063, 2081, and from the representation of 'Abraham' as Divine Good, dealt with in 2063 and in various places elsewhere.

[2] The manner in which the Lord's first rational was conceived and born has been stated in the previous chapter where Ishmael, who represented that rational, was the subject. This chapter and the next deal with that Rational which was made Divine by the Lord, something He achieved through the marriage-like conjunction of Divine Good with Divine Truth. The only possible way the first rational can be conceived is by the influx of the Internal Man into the External Man's affection for knowledge. Nor can it be born from anything other than the affection for knowledge, an affection represented by 'Hagar, Sarai's servant-girl', as shown in the previous chapter, in 1896, 1902, 1910, and elsewhere in that chapter.

[3] But the second or Divine Rational is not conceived and born in the same way but by the conjunction of Truth in the Internal Man with Good in the same, and the resulting influx. In the Lord's case this was achieved by His own power derived from the Divine itself, that is, from Jehovah. As stated in various places already, His Internal Man was Jehovah. And Good itself, represented by 'Abraham', belonged to the Internal Man, as also did Truth itself, represented by 'Sarah'. Both were on that account Divine, and from them both the Lord's Divine Rational was conceived and born. Indeed it was conceived and born from the influx of good into truth, and so by means of truth, for the principal element in the rational is truth, as stated above in 2072. Hence the statement here 'whom Sarah will bear to you', which means Divine Truth joined to Good from which it will come into being, and at verse 17 above the statement 'Sarah a daughter of ninety years' means that Truth joined to Good will accomplish this.

[4] With all human beings, since each has been created in the likeness and image of God, something similar yet not comparable takes place, in that his first rational too is conceived and born through the influx of his internal man into the life of his external man's affection for knowledge, but his second rational results from the influx of good and truth from the Lord by way of his internal man. This second rational he receives from the Lord when he is being regenerated, for at that time he senses within his rational what the good and truth of faith are. The internal man with anyone is above his rational, and is the Lord's. This is dealt with in 1889, 1940.

2072. 'And laughed' means the affection for truth. This becomes clear from the origin and essential nature of laughter. In origin it is nothing other than the affection for truth or the affection for falsity, which produces the mirth and pleasure exhibited in the face by means of laughter. This shows that the essential nature of laughter is nothing else. Actually laughter is something external belonging to the body since it belongs to the face; but in the Word interior things are expressed and are-meant by exterior. Just as all interior affections of both areas of mind (animus et mens) are expressed and meant by the face; interior hearing and obedience by the ear; internal sight, which is understanding, by the eye; power and strength by the hand and arm; and so on; so is the affection for truth expressed and meant by laughter.

[2] The principal element in man's rational is truth. Also present in the rational there is the affection for good, but this affection is present within the affection for truth, as the soul within it. The affection for good present within the rational does not express itself in laughter but in a type of joy and a resulting sense of delight which does not laugh. For laughter generally entails something that is not so good. The reason truth is the principal element in the rational man is that the rational is formed by means of cognitions of truth, for there is no other possible way in which anyone can become rational. Cognitions of good are truths just as much as cognitions of truth are truths.

[3] That 'laughter' here means the affection for truth becomes clear from the fact that this verse records Abraham's having laughed, as did Sarah both before Isaac was born and after, and also from the fact that he was given the name Isaac from 'laughter', for the word 'Isaac' means laughter. The fact that Abraham laughed when he heard about Isaac is clear from the present verse, for it is actually stated that when he heard about a son by Sarah he laughed. Sarah's laughing as well before the birth of Isaac when she heard from Jehovah that she was going to give birth is referred to as follows,

When Sarah heard at the tent door Sarah laughed within herself, saying, After I have grown old, shall I have the pleasure, and my lord being an old man? And Jehovah said to Abraham, Why did Sarah laugh, saying, Shall I in truth bear now I have grown old? Sarah denied it, saying, I did not laugh; for she was afraid. And He said, No, but you did laugh. Genesis 18:12-13, 15.

Also later on after Isaac's birth,

Abraham called the name of his son Isaac (laughter). Sarah said, God has made laughter for me; everyone hearing of it will laugh at me. Genesis 21:3, 6.

Unless 'laughing' and the name Isaac, which means laughter, embodied such things these occurrences would never have been mentioned.