Psalm 40:10 is the psalmist’s testimony that he has openly spoken of God’s righteousness, faithfulness, salvation, loving kindness, and truth to the whole community rather than keeping them to himself. The verse describes a person who has received God’s goodness and refuses to hide it, choosing instead to announce it publicly. It is spoken by King David, the traditional author of the psalm, and it is addressed to God while being declared before the great assembly of Israel.
I have not hidden your righteousness within my heart. I have declared your faithfulness and your salvation. I have not concealed your loving kindness and your truth from the great assembly.
Psalm 40:10 (WEB)
What Psalm 40:10 Means
The verse begins with a negative: “I have not hidden your righteousness within my heart.” The psalmist is saying that God’s right and faithful character was not something he kept private or stored away as a comfort only for himself. Righteousness here means God acting in rightness and justice, and the psalmist treats it as something too good to keep sealed inside.
The second and third sentences shift to active speech. “I have declared your faithfulness and your salvation” and “I have not concealed your loving kindness and your truth” describe a deliberate, public witness. Faithfulness and truth point to God keeping his promises, while salvation and loving kindness point to his rescuing and steadfast love. The verse does not promise that speaking about God will make life easier. It describes what a person does after experiencing God’s help, which is to tell others plainly what he has seen.
The Context of Psalm 40:10
Psalm 40 belongs to the Psalter, the collection of Israel’s songs and prayers, and it is traditionally attributed to David. The psalm moves from thanksgiving for a past deliverance, through a confession that God’s will is delightful to the psalmist, into a fresh plea for help in present trouble. The audience is the worshiping community, the “great assembly,” where God’s people gathered to hear and sing about what he had done.
Verse 10 sits in the middle of this movement. Just before it, in verses 7 and 8, the psalmist says that God’s law is within his heart and that he delights to do God’s will. Just after it, in verses 11 through 13, he asks God not to withhold his mercy and admits that troubles have surrounded him. Read in this setting, the public testimony of verse 10 is not a boast of perfection. It is the witness of someone who has been changed by God and who still needs God’s help, and who speaks of God’s faithfulness precisely because he is not yet free of trouble.
Key Phrases in Psalm 40:10
Psalm 96:2
Sing to the LORD! Bless his name! Proclaim his salvation from day to day!
(WEB)
This verse calls God’s people to proclaim his salvation day after day, which echoes the public testimony of Psalm 40:10. Both passages treat the announcement of God’s saving work as a regular, ongoing practice rather than a one-time event.
Mark 5:19
He didn’t allow him, but said to him, “Go to your house, to your friends, and tell them what great things the Lord has done for you, and how he had mercy on you.”
(WEB)
In this passage Jesus tells a man he healed to go home and report how much the Lord has done for him. The instruction mirrors the psalmist’s commitment to declare God’s mercy to those around him, showing the same pattern in the New Testament.
A Short Prayer From Psalm 40:10
Lord, you have been faithful to me in ways I have not always named out loud. Help me to speak of your righteousness, your salvation, and your loving kindness without shame or hesitation. Open my mouth when someone around me needs to hear what you have done, and give me the courage to tell the truth about you plainly. Keep me from hiding the good you have shown me, and let my words point others toward your faithfulness. Amen.
