And the LORD restored the fortunes of Job, when he prayed for his friends: also the LORD gave Job twice as much as he had before.
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George Leo Haydock
Penance. Hebrew, "return. "He resolved to restore him to his former prosperous condition, while he prayed for those who had so cruelly exercised his patience. (Calmet)
Protestants and Vatable, "the Lord turned the captivity of Job: "so any great distress may be styled, though Job was in a manner abandoned to the power and bondage of satan. Septuagint, "But the Lord gave an increase to Job, and while he was praying for his friends, He forgave them their sin. And "(Haydock)
Twice, excepting children, who were living (Worthington) with God. (Rabbins) (St. Gregory)
Some also include the years of Job's life, but that is not clear, (see Spanheim, c. 7.; Calmet) though not improbable; as he might very well live twice as long as he had done, if we suppose that he was about (Haydock) 50 when he was so much distressed (Petau); and thus arrived at the age of 140, ver. 16. (Haydock)
21. For he is before shewn to have been heard in behalf of his friends, when the circumstance, which we before mentioned, is stated; They did according as the Lord had spoken, and the Lord accepted the face of Job. But when it is immediately observed, The Lord also was turned at the penitence of Job, when he prayed for his friends; it is plainly shewn, that a penitent has deserved to be heard the more quickly in his own behalf, the more devoutly he has interceded for his friends. For he makes his prayers more powerful in his own behalf, who offers them also in behalf of others. For that sacrifice of prayer is more willingly received, which, in the sight of the merciful Judge, is flavoured with love for one’s neighbour. And a person then truly adds to its amount, if he offers it even for his enemies. For hence is that, which the Truth Who is our Teacher says; Pray for them that persecute and calumniate you. [Luke 6, 28] Hence again He says, When ye shall stand to pray, forgive if ye hav...
But when the text immediately adds, “And the Lord turned to the penitence of Job, when he had prayed for his friends,” it clearly shows that through penitence he deserved to have his prayers fulfilled promptly, because he had interceded for others. He held that his prayers were effective for him, as he had offered them for others. The merciful Judge more favorably receives the sacrifice of prayer when it is accompanied by the love of neighbor, and one enriches it even more truthfully when he offers it for his enemies as well. - "Morals on the Book of Job 35.21"