Hymns are portable sermons that articulate, exegete and pronounce biblical truths. They shape the way we view God, man and Christ, and how we are to live in light of the gospel. The truths they communicate preach to us throughout the week following the style of Deuteronomy 6—at home and away, when lying down and waking. As R.W. Dale famously said, “Let me write the hymns of the church and I care not who writes the theology.”

Throughout the week, other things call for our praise, attention and affection. Singing hymns of God’s character reminds us of his greatness. Singing hymns of our sin reminds us of the role of confession. By singing hymns of the atonement, we remind one another of the efficacy of the work of Jesus. Hymns of consecration remind us of the dependence of the Christian upon the steadfast grace of God.

We should choose historic hymns that provoke thankful hearts. The aim of singing hymns is engaging both the head and the heart. Just as we read and meditate on the Scriptures to see and worship God, so we choose songs that teach robust theological truth that causes our hearts to erupt with praise. The chief end of theology is doxology.

Surely the hymns recorded for us in Scripture are meant for singing hymns in church. In these songs of praise and prayer, contrition and confession, we see the breadth and inclusiveness of the hymns the church has sung for ages.

Reference https://churchleaders.com/worship/worship-articles/254977-vintage-worship.html/2