A personal hymn of adoration, prayed kneeling before the tabernacle.
Saint Thomas speaking in the first person to Christ hidden under the appearance of bread.
When: During adoration, in thanksgiving after Communion, or in a quiet church at any hour.
Why: Every other Eucharistic hymn teaches. This one simply kneels. It admits the senses are useless here and asks for the sight of God face to face instead.