From Fr. Réginald Garrigou-Lagrange, O.P. - Christian Perfection and Contemplation, pp. 12-14.
(Full work on PDF available from ITOPL.)
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From Garrigou-Lagrange, O.P., Christian Perfection and Contemplation (1937), Ch. 2, Art. 2, n. 2; pp. 27-9, available from ITOPL.