On Piety By: Jean Guibert

On Prayer and The Contemplative Life By: Aquinas Thomas

On Singing and Music By: Society of Friends

On the Babylonian Captivity of the Church By: Martin Luther

On the Exercises of Piety By: Jean Guibert

On the Indian Sect of the Jainas By: Johann Georg Bühler

One Common Faith By: Bahá'í International Community

Opportunities By: Susan Warner

Orthodox Faith By: Saint John of Damascus

Orthodoxy: Its Truths And Errors By: James Freeman Clarke

Our Little Lady Six Hundred Years Ago By: Emily Sarah Holt

Our Unitarian Gospel By: Minot J. (Minot Judson) Savage

Out in the Forty-Five Duncan Keith's Vow By: Emily Sarah Holt

Out of the Deep Words for the Sorrowful By: Charles Kingsley

Out of the Triangle: a story of the Far East By: Mary E. (Mary Ellen) Bamford

Pagan and Christian creeds: their origin and meaning By: Edward Carpenter

Pagan and Christian Rome By: Rodolfo Amedeo Lanciani

Pantheism, Its Story and Significance Religions Ancient and Modern By: J. Allanson Picton

Parables from Flowers By: Gertrude P. Dyer

Parables of the Christ-life By: Isabella Lilias Trotter

Parables of the Cross By: Isabella Lilias Trotter

Parables of the Lord Jesus Christ - Commentary on the Gospel of St Matthew By: St. John Chrysostom

Paradise Regain'd (version 2) By: John Milton

Paris Talks By: Unknown

Parochial and Plain Sermons, Vol. VII (of 8) By: John Henry Newman

Parochial and Plain Sermons, Vol. VIII (of 8) By: John Henry Newman

Path of Light - The Bodhi-Charyavatara of Santi-Deva By: Shantideva

Paul Gerhardt's Spiritual Songs Translated by John Kelly By: Paul Gerhardt

Paula the Waldensian By: Eva Lecomte

Pearl Maiden By: Henry Rider Haggard

Personal Experiences of S. O. Susag By: S. O. Susag

Personal Friendships of Jesus By: J. R. (James Russell) Miller