Verse 1 And so it was, that Isaac was old and his eyes were becoming dark so that he could not see; and he called Esau his elder son and said to him, My son; and he said to him, Here I am.

'So it was, that Isaac was old' means when the state was reached. 'And his eyes were becoming dark so that he could not see' means when the Rational wished to enlighten the Natural from the Divine. 'And he called Esau his elder son' means the affection for natural good, or the good of life. 'And he said to him, My son; and he said to him, Here I am' means presence as the result of foresight and provision.