It is Pentecost on Sunday. This prayer is attributed to Stephen Langton (†1228), Archbishop of Canterbury. The original Latin text and this translation from Leonardo Boff, Come, Holy Spirit: Inner Fire, Giver of Life and Comforter of the Poor
Veni, Sancte Spiritus (Come, Holy Spirit)
Come, Holy Spirit, send forth the heavenly radiance of your light.
Come, father of the poor, come, giver of gifts,
come, light of the heart.
Greatest comforter, sweet guest of the soul, sweet consolation.
In labour, rest, in heat, temperance, in tears, solace.
O most blessed light, fill the inmost heart of your faithful.
Without your light there is nothing in the human,
nothing that is pure.
Cleanse that which is unclean, water that which is dry,
heal that which is wounded.
Bend that which is inflexible, fire that which is chilled,
correct what goes astray.
Give to your faithful, those who trust in you, the sevenfold gifts.
Grant the reward of virtue, grant the deliverance of salvation,
grant eternal joy.