The Collect for The Second Sunday before Advent
From Common Worship

Heavenly Father,
whose blessed Son was revealed
to destroy the works of the devil
and to make us the children of God and heirs of eternal life:
grant that we, having this hope,
may purify ourselves even as he is pure;
that when he shall appear in power and great glory
we may be made like him in his eternal and glorious kingdom;
where he is alive and reigns with you,
in the unity of the Holy Spirit,
one God, now and for ever.
Amen.