Dear Friends,
This is a question I've wanted to ask for a while, and perhaps we can tackle this.
Our Liturgies/Offices use many hymns which are either directly or partially taken from the Holy Scriptures. The hymn "Glory to God in the Highest" is the song of the angels at Christ's birth with other themes rolled in. The "Holy, Holy, Holy" right before the Eucharistic prayer is the song of the cherubim in Isaiah (went over this during Lent

). Those are just two examples that I wanted to focus on for now.
Because these hymns are always around day after day, week after week, we can sometimes pass over them without much note. And yet, it seems that a fuller appreciation of these hymns would probably help us appreciate the "heaven on earth" reality of the Liturgy, when we sing with the angels the hymns of the angels.
What are some ways we can more fully appreciate these scriptural hymns and thus enter more fruitfully into the Liturgy when normally we might be tempted to pass over them as ordinary hymns?