Charles H. Spurgeon on Psalms 125:4

Do good, O LORD, unto those that be good, etc. Perhaps it may not prove unprofitable to enquire, with some minuteness, who are the persons for whom prayer is presented, and who have an interest in the Divine promises. They are brought before us under different denominations. In Ps 125:1, they are described as trusting in the Lord: in Ps 125:2, they are described as the Lord's people: in Ps 125:3, they are called the righteous: in Ps 125:4, they are called good and upright in heart: and in Ps 125:5, they are called Israel. Let us collect these terms together, and endeavour to ascertain from them, what is their true condition and character, for whose security the Divine perfections are pledged. And while a rapid sketch is thus drawn, let each breathe the silent prayer, "Search me, O God, and know my heart; try me, and know my thoughts; and see if there be any wicked Way in me, and lead me in the way everlasting." —N. M'Michael, in "The Pilgrim Psalms," 1860.