Peter Lombard, Sentent., II, d. 1, c. 4 (QR I:309).
St. Gregory, In Evang., II, 26 (PL 76:1197).
Moses Maimonides, Guide for the Perplexed, I, 34 (FR:44-49).
St. Augustine, De Praedestinatione sanctorum, V (PL 44:968).
In the reply of this article, and in the answer to the seventh difficulty.