What "They Shall Renew Their Strength" means
Don Moen's "They Shall Renew Their Strength" is a Scripture song at its core, built directly from Isaiah 40:31, and that is both its defining characteristic and its primary gift. Scripture songs operate differently from other worship music. They do not add a poetic commentary on a passage. They carry the passage itself into the room, so that the singing of the song is simultaneously the singing of Scripture. What the congregation is doing when they sing this song is rehearsing a promise. Not paraphrasing it, not reflecting on it, but speaking it back into the air with their own voices, which is a particular act of faith. The promise of Isaiah 40 belongs to a specific context: the prophet is speaking to a people in exile, exhausted, asking whether God has forgotten them. The answer God gives is not a roadmap. It is an image: those who wait on me will mount up with wings like eagles, they will run and not grow weary, they will walk and not faint. That image does not explain the mechanics of renewal. It describes the result. By the time a congregation has sung this song through, they have not only heard about renewal. They have, in some real sense, practiced expecting it.
What this song does in a room
At 80 BPM in 4/4, "They Shall Renew Their Strength" moves at the pace of a steady walk, which is fitting for a song about people who have run out of energy and are learning to wait for God's replenishment. The tempo does not demand anything from the congregation. It offers a pace they can sustain without effort, which is itself a form of pastoral intelligence. What this song does in a room is name the experience of exhaustion without shame. There is something significant about a congregation of worship leaders and church workers singing together about waiting on the Lord and being renewed, particularly in seasons when the work has been heavy and the reserves are low. The song gives collective permission to admit the weariness without surrendering to it. The repetition built into a Scripture song like this is not filler. It is the repetition of medicine. A promise does not fully inhabit a person on the first hearing. It takes repeated contact, repeated singing-back, before the content of the promise begins to displace the weight of the anxiety or exhaustion it is meant to address. In that sense, the song is doing something closer to prayer than performance.
What this song is saying about God
"They Shall Renew Their Strength" says that God is the source of energy that does not deplete. Human strength runs out. The song does not argue with that. It assumes it. The person who mounts up like an eagle is not someone who managed their energy better. They are someone who received something from outside themselves that they could not generate on their own. The song says that God has not abandoned the exhausted, the burned-out, the person who is walking rather than running because running is no longer possible. To those people, the song offers not a faster pace but a different source. Waiting on the Lord is not passive. It is an active reorientation of dependence, a turning from self-generated effort toward a strength that comes as gift. There is also something the song says about God's knowledge of human limitation. Isaiah 40 opens with a portrait of a God who sees exactly how heavy the burden of his people is, who says comfort, comfort my people. The promise of renewal in verse 31 arrives after that watching. It is a knowing response, not a generic one. God sees the specific person who is barely walking, and to that specific person the eagle-wings promise is addressed.
Scriptural backbone
Isaiah 40:31 is the spine of the song: "But they who wait for the Lord shall renew their strength; they shall mount up with wings like eagles; they shall run and not be weary; they shall walk and not faint." The context sharpens the song's purpose. Verses 28-29 immediately precede it: "Have you not known? Have you not heard? The Lord is the everlasting God, the Creator of the ends of the earth. He does not faint or grow weary; his understanding is unsearchable. He gives power to the faint and to him who has no might he increases strength." The song is not a general wellness promise. It is a specific promise to the depleted, grounded in the character of a God who does not Himself grow weary. Psalm 103:5, which speaks of God renewing youth like the eagle's, provides a parallel image. Matthew 11:28-30 carries the same pastoral weight: "Come to me, all who labor and are heavy laden, and I will give you rest." The song is a congregational practice of that coming. Galatians 6:9 provides the New Testament echo: "Let us not grow weary of doing good, for in due season we will reap, if we do not give up." These passages together define the theological territory this song inhabits.
How to use it in a service
"They Shall Renew Their Strength" works best in services where the congregation needs to be met in their weariness before they can be called to action. It is not a closing song that sends people out energized. It is a mid-service song that refills before anything is poured out. Place it after a season of extended worship when the congregation has already moved past the surface level of Sunday morning presentability. Or place it in a service specifically designed around rest, renewal, or the sustainability of faith in demanding seasons. In contexts where your congregation includes many ministry workers, pastors, or caregivers, this song carries additional pastoral freight. It names the occupational hazard of those vocations, the running-until-empty cycle, and offers a different practice. For a congregational retreat, this song can anchor a full session on spiritual sustainability. For a summer series on the rhythms of faith, it belongs in the episode on rest or renewal. At a team prayer meeting or pre-service gathering for worship team and volunteers, the song can function as a team-wide prayer before the work begins, setting the posture of dependence before performance starts.
Things to watch for as the worship leader
Scripture songs create a particular vulnerability in the worship leader: the temptation to explain the Scripture rather than let the congregation experience it. Your job here is to get out of the way and let the promise do its work. If you feel the impulse to speak about Isaiah 40 before the song, keep the introduction very brief, just enough to name where the song is coming from, and then trust the song to carry the rest. Watch for the moment when the congregation moves from singing-a-song to meaning-a-prayer. That transition is usually visible in the quality of attention in the room. When it happens, hold the pace steady. Do not speed up to maintain energy. The energy appropriate to this song is not the energy of a party. It is the energy of a people receiving a promise, which is quieter and deeper than celebration. Key of Bb male is comfortable for most baritone and bass-range voices in a congregation, though it sits slightly low for some tenors. If your congregation tends toward a higher vocal range, a capo on the second or third fret can bring the song up without losing the accessibility of the original register.
A note for the team behind you (techs, vocalists, band)
This is a song where the full band playing from bar one can work against the purpose. Consider a stripped entry: acoustic guitar and key pads only for the first full pass, with bass and drums entering on the second or third pass to add weight without overwhelming the intimacy of the opening. Drummers: at 80 BPM, a gentle kick and snare with soft hi-hat keeps the song moving without driving it. This is not the song for fills. The space between the beats is part of the texture. Vocalists: the melody of a Scripture song benefits from clean, clear diction above melodic performance. Every syllable of the Isaiah text carries theological content, and blurring it under ornamentation or harmony removes what makes the song different from a thematic anthem. Sing the words cleanly, let harmonies support without competing, and resist the urge to improvise over the Scripture lyric. Techs: the vocal needs to sit at the front of the mix for this song to work. The congregation is learning to sing a promise, and they need to hear every word clearly in order to sing it back with meaning. Compression on the lead vocal should preserve dynamic variation rather than flatten it.