God has to be searched and invoked in the secret of a rational soul, which is called the interior man.
(De magistro 1)
In the material world, a foot is one thing, a ladder is another and wings still another. In the interior world, however, feet, ladders, and wings are the affections of a good will, with them, we walk, we climb, and we fly.
(En. in ps. 38, 2)
Man was not created as an irrational animal bent toward the earth but, erect in stature, a reminder to look above.
(De Civ. Dei XXII, 24, 4)