Do good, O LORD, to those who are good, and to the upright in heart.
PSALM 125 As the faithful being mingled in this world with the ungodly seem to be exposed to all the ills of life in the same manner as other people, the Prophet, comparing them to Jerusalem, shows that they are defended by an invincible bulwark. And if God at any time suffer them to be plagued by the malice of the wicked, he exhorts them to be of good hope.
Commenting on Psalm 125:1-5
Do good, O Lord, unto those that be good, and to them that are upright in their hearts. Men to be good at all must be good at heart. Those who trust in the Lord are good; for faith is the root of righteousness, and the evidence of uprightness. Faith in God is a good and upright thing, and its influence makes the rest of the man good and upright.
Here is, 1. The prayer the psalmist puts up for the happiness of those that are sincere and constant (Psa 125:4): Do good, O Lord! unto those that are good. This teaches us to pray for all good people, to make supplication for all saints; and we may pray in faith for them, being assured that those who do well shall certainly be well dealt with.
Commenting on Psalm 125:4-5