Philo Judaeus De Fuga Et Inventione 167

[167] This is the man whom the law calls Isaac, whom the soul did not conceive at one time and bring forth at another, for says the scripture, "having conceived him she brought him forth," ¹ as if without any consideration of time. For it was not a man who was now being thus brought forth, but a conception of the purest character, beautiful rather in its nature than in consequence of any study; for which reason also she who brings him forth is said to have given up the usual manner of women, that is to say her usual, and reasonable, and human customs.