The collect for purity - Book of Common Prayer: Almighty God, to you all hearts are open, all desires known, and from you no secrets are hid: Cleanse the thoughts of our hearts by the inspiration of your Holy Spirit, that we may perfectly love you, and worthily magnify your holy Name; through Christ our Lord. Amen.
The 1928 Book of Common Prayer is used in the Anglican Church. It includes Holy Communion, Morning Prayers, Evening Prayers, Psalms and more. The original book, published in 1549 (Church of England 1957) http://www.pbsusa.org