Thomas Aquinas

And as to his diligent protection: in all their affliction; and he himself was troubled, from compassion; or he was not troubled, right away, but he delayed even now, that they might be corrected; and the angel of his face, that is, the angel that sees my face, saved them, as their leader in the desert: lead this people whither I have told you: my angel shall go before you (Exod 32:34); he has given his angels charge over you; to keep you in all your ways (Ps 90:11). …

Commentary on Isaiah ↗