Genesis 12:11

Beautiful: having yet had no children, though she must have been 65 years old. Abram acts with prudence, and does not tempt God: if he had made known that the woman was his wife, he would have exposed his life to imminent danger, amid a cruel and lascivious people; and being convinced of the chastity of Sarai, he did not, in the least, apprehend that she would consent to any violation of her conjugal engagements. He did not, therefore, expose her virtue as the Manichees pretended. (St. Augustine, contra Faust. xxii. 33; City of God xvi. 19.) (Haydock; Calmet) --- The event proved the justice of Abram's suspicions, and God's interference shewed that he was not displeased with his concealing part of the truth. Who can be so simple as to suppose, that we are bound to explain all our concerns to a foe? Do not we every day act with the like caution as Abram did, when we have reason to fear danger? Do not we wish, when fleeing from an enemy's country, that he should conclude we were taking a walk of pleasure? (Haydock)