whose affairs are guided by justice
Justice in the biblical sense involves righteousness and fairness, rooted in God's character. The Hebrew concept of justice (mishpat) encompasses not only legal fairness but also social equity and moral integrity. In the historical context of Israel, justice was a foundational aspect of the covenant community, as seen in Deuteronomy 16:20, which commands the pursuit of justice. This phrase suggests that a person's dealings, whether in business or personal matters, should reflect God's standards of justice. The prophets frequently called Israel back to justice, as seen in Micah 6:8. In the New Testament, Jesus embodies perfect justice, and believers are called to emulate His example, as seen in Matthew 23:23. This phrase underscores the importance of aligning one's life with God's righteous standards, ensuring that all actions are conducted with fairness and integrity.

• Scripture calls the righteous life “well” because God Himself guarantees blessing. Psalm 1:3 promises, “Whatever he does will prosper,” while Isaiah 3:10 says, “Tell the righteous it will be well with them.”

• This well-being reaches every corner of life—spiritual, emotional, material—because “the LORD will not withhold any good thing from those who walk uprightly” (Psalm 84:11).

• Romans 8:28 affirms that “all things work together for good to those who love God,” underscoring that the Lord defines and secures our ultimate good, not shifting circumstances.

• The verse zeroes in on one individual: any man or woman who takes God at His Word. Psalm 128:1 says, “Blessed are all who fear the LORD, who walk in His ways,” showing that personal obedience invites personal blessing.

• This emphasis keeps us from vague ideals. Proverbs 10:6 notes, “Blessings crown the head of the righteous,” reminding each believer that faithfulness has concrete results.

• Paul urged Timothy, “But you, O man of God, flee from these things and pursue righteousness” (1 Timothy 6:11), stressing that every believer is personally responsible to live out God’s standards.

• Generosity reflects God’s own heart. Proverbs 22:9 promises, “A generous man will be blessed, for he shares his bread with the poor.”

• True giving is free from reluctance: “God loves a cheerful giver” (2 Corinthians 9:7).

• Jesus set the pattern: “It is more blessed to give than to receive” (Acts 20:35). Thus, generosity is not peripheral—it is central to walking in God’s blessing.

• Luke 6:38 links giving and receiving: “Give, and it will be given to you… For with the measure you use, it will be measured back to you.”

• Lending freely shows trust in God rather than in possessions. Deuteronomy 15:7-8 instructs Israel to open wide hands to the needy, illustrating practical faith.

• Jesus echoed this: “Give to the one who asks you” (Matthew 5:42) and, “Lend, expecting nothing in return; then your reward will be great” (Luke 6:35).

• Psalm 37:26 portrays the righteous: “They are ever generous and lend freely; their children will be blessed.” Such open-handed living invites God’s ongoing favor.

• Justice means daily decisions align with God’s standards. Micah 6:8 summarizes: “He has shown you… what is good: to act justly, to love mercy, and to walk humbly with your God.”

• Proverbs 21:3 declares, “To do righteousness and justice is more acceptable to the LORD than sacrifice,” stressing that fair dealings please God more than ritual.

• Employers are told, “Provide your slaves with what is right and fair” (Colossians 4:1), proving justice applies to every relationship.

• James 2:15-17 warns that faith without just action toward others is dead, reinforcing that genuine faith produces equitable conduct.

Psalm 112:5 paints a comprehensive picture of the blessed believer: personally responsible, generous, ready to lend, and committed to justice. Such a life experiences the settled assurance that “it is well,” because God’s unchanging promises secure present well-being and future reward.

He will guide . . .--Rather, he will gain his cause: in (the) judgment. So apparently the LXX. and Vulg. Others, "he will sustain his affairs by justice." The verb primarily means "to measure," but in the conjugation here used has the sense of "sustains." (See Genesis 45:11; Genesis 47:12; Genesis 1:21, where the Authorised Version has "nourish.") The meaning is confirmed by the parallelism of the next verse.