O God, whose blessed Son was manifested that he might destroy the works of the devil, and make us the sons of God, and heirs of eternal life: Grant us, we beseech thee, that, having this hope, we may purify ourselves, even as he is pure; that, when he shall appear again with power and great glory, we may be made like unto him in his eternal and glorious kingdom; where with thee, O Father, and thee, O Holy Ghost, he liveth and reigneth, ever one God, world without end. Amen.
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Note: According to the BCP rubrics, the collect and readings for Trinity 25 this year are those for Epiphany 6. (See BCP p 258)