Classic Works

Pamphili Eusebius - Ecclesiastical History (a.k.a. Church History)

Eusebius of Caesarea (ca. 263 - 339) is often called "The Father of Church History".  He became the bishop of Caesarea Palaestina around 314.  Ecclesiastical History was written during the latter part of Eusebius' life.  It gives a chronological account of the Christian Church starting in the first century.

Thomas À Kempis - The Imitation of Christ

Thomas À Kempis (ca. 1380 - July 25, 1471) was a German-born Catholic monk.  The Imitation of Christ was originally published around 1418.  It shows the importance and application of the principles of Christ's life to your own life.