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)
It is better to wage war with hope of eternal peace than servitude without hope of liberation.
(De Civ. Dei XXI, 15)
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)