I love this translation of Tantum Ergo, by Fr James Quinn SJ. It’s the version used in The Daily Office SSF‘s liturgy for thanksgiving for holy communion:
Come adore this wondrous presence,
Bow to Christ the source of grace.
Here is kept the ancient promise
Of God’s earthly dwelling place.
Sight is blind before God’s glory,
Faith alone may see his face.
For the full version, see here.
I especially loved the two highlighted lines: the Lord’s Supper as a fulfilment of God’s promise, made repeatedly throughout the Old Testament, to dwell among his people. See, for example, Ezekiel 37:26-27:
I will make a covenant of peace with them; it shall be an everlasting covenant with them; and I will bless them and multiply them, and will set my sanctuary among them for evermore. My dwelling-place shall be with them; and I will be their God, and they shall be my people.