Bertrand de Margerie, S.J.
“[T]ruth is the Trinity.”
Matthias Joseph Scheeben“The Blessed Trinity is the mystery of mysteries, before which even the seraphim veil their countenances singing with astonished wonder their thrice-repeated ‘Holy.’”
 Cited in Giles Emery, Trinity in Aquinas (Ypsilanti, Mich.: Sapientia Press, 2003), 1.
 Betrand de Margerie, The Christian Trinity in History (Studies in Historical Theology; trans. E. J. Fortman; Petersham, Mass.: St. Bede’s Publications, 1982), xvii.
 Matthias Scheeben, Mysteries of Christianity (trans. C. Vollert; St. Louis: B. Herder Book, Co., 1946 [1865/1888]), 25.