Sung immediately before the priest blesses the people with the Blessed Sacrament.
The last two verses of the Pange Lingua, sung on their own at Benediction while incense is offered.
When: At the close of adoration, just before the blessing.
Why: It says plainly that the senses fail here and faith supplies the rest. It is the Church teaching a person how to stand in front of something the eyes cannot verify.