[30] And the clearest possible proof of this is, that no one who conversed with Isaac was a mere mortal. Rebecca, that is perseverance, asks her servant, seeing but one person, and having no conception but of one only, "Who is this man who is coming to meet us?" For the soul which perseveres in what is good, is able to comprehend all self-taught wisdom, which is named Isaac, but is not yet able to see God, who is the guide of wisdom.