For Whitsunday (Pentecost)

O God, who purifiest the heart of man from sin, and makest it more white than snow, pour down upon us the abundance of Thy mercy; renew, we beseech Thee, Thy Holy Spirit within 53 us, that we may show forth Thy praise, and, strengthened by Thy grace, may obtain rest in the eternal mansions of the heavenly Jerusalem; through our Lord Jesus Christ. Amen. —Sarum Breviary