Summary of comments of this office by Dom Schuster, in his work L'année liturgique.

The Introït borrows its antiphon from Psalm 24, in which, in the Hebrew text, the initial letter of each verse is in alphabetic order. "Look Thou upon me, O Lord, and have mercy on me; for I am alone and poor. See my abjection and my labor; and forgive me all my sins, O my God."

The Gradual is the same as the one for the Thursday after Ash Wednesday. He who puts his trust in the Lord, as Psalm 54 says, finds in Him deliverance from danger, help in distress, comfort in sorrow.

The versicle of the Alleluia is taken from Psalm 7. God is a just judge, strong and patient; He will not always be angry, for He is good and merciful.

The antiphon of the Offertory, taken from Psalm 9, is the same as that of the third ferial day after Passion Sunday: "Let them trust in Thee, all who know Thy name, O Lord: for Thou hast not forsaken them that seek Thee: sing ye to the Lord, who dwelleth in Sion: for He hath not forgotten the cry of the poor."

The antiphon of the Communion is borrowed from the Gospel of the day: "I say to you: there is joy before the angels of God upon one sinner doing penance."