Arcana Coelestia #3959
3959. 'Leah conceived again and bore a sixth son to Jacob' means reception and acknowledgement, that is to say, of truth. This is clear from the meaning of 'conceiving' as receiving, and of 'bearing' as acknowledging, dealt with above in 3955, and from the meaning of 'son' as truth, dealt with in 489, 491, 533, 1147, 2623, 3373.
Arcana Coelestia #2623
2623. 'A son' means the Divine Rational. This is clear from the meaning of 'a son'. In the internal sense of the Word 'a son' means truth, 489, 491, 533; and because truth is the principal element in the rational, 2072, 2189, 'a son' also means the rational. But here the Divine Rational is meant in which the principal element is good. 'Isaac' too, to whom 'a son' refers, represents this good, as will be shown further on.