'And Sarah saw' means the Lord's insight from the Divine spiritual. 'The son of Hagar the Egyptian' means into the merely human rational, 'Hagar the Egyptian' being the affection for knowledge, from which affection as its mother that rational was born. 'Whom she had borne to Abraham' means that it was given manifestation from the Divine celestial as a father. 'Mocking' means not in agreement with or favourably disposed towards the Divine Rational.