Treatise on Good Works by Luther, Martin (1483-1546)

is considered Luther’s clearest exposition on Christian life and the relationship between faith and good works. Contrary to the teachings of the Roman church of his day, Luther taught that people need not perform extraordinary acts of religious devotion to be saved, but rather that Christ saves them by grace through faith.

Prayer Availeth Much by Anderson, Tony Marshall (1888-1979)

Taking its title from James 5:16, Prayer Availeth Much is a challenge to Christians; it is a challenge to explore "the boundless possibility of prayer," as the forward puts it.

Of Prayer—A Perpetual Exercise of Faith. The Daily Benefits Derived from It. by Calvin, John (1509-1564)

The Daily Benefits Derived from It. This treatise on prayer comes from Book III, Chapter 20 of Calvin's magnum opus, Institutes of the Christian Religion. In it, Calvin answers questions concerning to whom Christians should address their prayers, how they should formulate prayers, and what practices may benefit or injure the development of a prayerful life.

Call to the Unconverted to Turn and Live by Baxter, Richard (1615-1691)

This 17th century Puritan devotional became wildly popular even after only a year following its publication. In some ways, the book’s popularity was somewhat of an anomaly.

Working For God! by Murray, Andrew (1828-1917)

In Working for God, Andrew Murray calls Christians to be instruments of God. Murray divides this call into thirty-one chapters, which are ideal for daily devotions for any given month.

Holy Wisdom: or, Directions for the Prayer of Contemplation by Baker, Augustine (1517-1641)

As a Catholic priest in 17th century England, Augustine Baker lived in constant danger. His persecutors followed him wherever he went to pray and profess religion.

Ascent of the Son--The Descent of the Spirit: Kuyper Meditations by Kuyper, Abraham (1837-1920)

Abraham Kuyper, the widely respected Dutch theologian, offers the world a book of deep spiritual meditations in The Ascent of the Son—The Descent of the Spirit.

Union and Communion by Taylor, James Hudson (1832-1905)

Hudson Taylor is perhaps best known for his outstanding missionary work in China. However, later in his life, he published this little commentary on Song of Solomon in 1893.

Christian in Complete Armour by Gurnall, William (1617-1679)

Body of Practical Divinity by Gill, John (1697-1771)

, John Gill presents his beliefs on the worship of God. The first section of his text features advice to Christians participating in internal worship. According to Gill, the worshippers should experience thankfulness, humility, and self-denial as they commune with God.