2637. 'When Isaac his son was born to him' means when the Lord's Rational was made Divine. This is clear from the meaning of 'being born' as being manifested, dealt with in 2584, 2621, 2629, and from the representation of 'Isaac' as the Divine Rational, dealt with in 2630. The latter is said 'to be born' to Abraham when it has been made Divine, as also in verse 3 above, 'Abraham called the name of his son born to him', see 2628.