All the paths of the LORD are mercy and truth unto such as keep his covenant and his testimonies.
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Augustine of Hippo
10. "All the ways of the Lord are mercy and truth" (ver. 10). And what ways will He teach them, but mercy wherein He is placable, and truth wherein He is incorrupt? Whereof He hath exhibited the one in forgiving sins, the other in judging deserts. And therefore "all the ways of the Lord" are the two advents of the Son of God, the one in mercy, the other in judgment. He then attaineth unto Him holding on His ways, who seeing himself freed by no deserts of his own, lays pride aside, and henceforward bewares of the severity of His trial, having experienced the clemency of His help. "To them that seek His testament and His testimonies." For they understand the Lord as merciful at His first advent, and as the Judge at His second, who in meekness and gentleness seek His testament, when with His Own Blood He redeemed us to a new life; and in the Prophets and Evangelists, His testimonies. ...
Seek. Hebrew, "keeps. "But no one seeks after the law, who does not strive to keep it. (Berthier)
Jesus Christ showed mercy at his first coming, and he will display truth at his second, judging all with equity. (St. Augustine)
Testimonies. When God gave the law to manifest his will, he attested heaven and earth, that all might observe it carefully. (Calmet)
The law is God's covenant, and the testimony of his will. He mercifully preventeth us with his grace, and will reward with truth and justice. (Worthington) ...