excellent [yaqar] is thy lovingkindness [checed], O God ['elohiym]!
therefore the children [ben] of men ['adam] put their trust [chacah]
under the shadow [tsel] of thy wings [kanaph]. KJV-Interlinear
precious is your steadfast love, O God! The children of mankind take refuge in
the shadow of your wings. ESV
Once Gods righteousness and justice have been applied for the judgment of sin, and then Gods faithfulness applied for the assurance and security of the pardon or forgiveness obtained as a result of the judgment, then Gods loving-kindness or mercy is the next natural step for the grace blessings that God gives.
Mercy is grace in action.
Grace is the promise, and mercy is the action of fulfilling those promises of blessings.
Righteousness, justice, and faithfulness assure us of eternal security in eternal life. And His mercy is what we may flee to, or look to, for our refuge in Him, from the demands and pressures of this world.
The shadow of the wings is the place where the young and helpless chicks go to for their refuge under the wings of the parent. This is their ultimate safety from all predators and all problems.
And of course using that same symbolism, the wings of God offer the best and greatest protection from all problems and adversities.
We find His wings in the Bible doctrine which we learn from our daily studies of the Bible.