This Mass tells of the virtue of charity, for the Holy Ghost whom Christ is about to send us is a Spirit of love. As Spirit of charity He dispenses His gifts for the benefit of all (Epistle); as Spirit of truth He makes us understand the teaching of Jesus.
The Holy Ghost will also console us in the midst of our tribulation (Gospel), and "will keep us from evil" (Communion).
Exaudi, Domine, vocem meam, qua clamavi ad te, alleluia: tibi dixit cor meum, quaesivi vultum tuum, vultum tuum, Domine, requiram: ne avertas faciem tuam a me, alleluia, alleluia. * Dominus illuminatio mea, et salus mea: quem timebo?
Hear, O Lord, my voice with which I have cried to Thee, alleluia; my heart hath said to Thee, I have sought Thy face, Thy face, O Lord, I will seek: turn not away Thy face from me, alleluia, alleluia. * The Lord is my light and my salvation: whom shall I fear?
(Psalm 26:7,8,9,1 from the Introit of Mass)
Omnipotens sempiterne Deus: fac nos tibi semper et devotam gerere voluntatem: et majestati tuae sincero corde servire.
O almighty and eternal God, grant us ever to have a will devoted to Thee, and with a sincere heart to serve Thy majesty.