Almighty God, who on this day didst open the way of eternal life to every race and nation by the promised gift of thy Holy Spirit: shed abroad this gift throughout the world by the preaching of the Gospel, that it may reach to the ends of the earth; through Jesus Christ thy Son our Lord, who liveth and reigneth with thee, in the unity of the same Holy Spirit, ever one God, world without end. Amen.
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"St. Peter Preaching in the Presence of St. Mark"
by Fra Angelico (painted c.1433)