Summa theologiae I, Q. 51, art. 3.
" Q, 50. The substance of the angels absolutely considered, art. 1-5.
Chase, Steven. Angelic Spirituality: Medieval Perspectives on the Ways of Angels. New york: Paulist Press. 2002, contains Augustine, Gregory, Bernard of Clairvaux, Hugh of St Victor, Umilta of Faenza, Dionysius the Areopagite, John Scotus,
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