Today is Pentecost, the celebration of the descent of the Holy Spirit upon the Apostles in the book of Acts, making manifest the Church. Here is a prayer for Pentecost, taken from the Book of Common Prayer (and the Anglican-Use version I am sure):

O God, who on this day didst teach the hearts of thy faithful people by sending to them the light of thy Holy Spirit: Grant us by the same Spirit to have a right judgment in all things, and evermore to rejoice in his holy comfort; through the merits of Christ Jesus our Savior, who liveth and reigneth with thee, in the unity of the same Spirit, one God, world without end. Amen.

From ChurchYear.Net’s Pentecost Prayers and Collects