James Buchanan (1804–1870) was a Scottish minister and theologian. He joined the Free Church of Scotland in 1843, and succeeded Thomas Chalmers as professor of systematic theology at the New College of the Free Church in Edinburgh in 1847, a post he held for twenty-one years. Buchanan's magnum opus was The Doctrine of Justification, which still has great value as a classic treatment of the article by which Martin Luther says the church stands or falls. He covers biblical, systematic, and historical ground in his work, but is never far from a warm-hearted evangelical delight in the doctrines he is expounding.

In this seminal work of Christian theology, John Owen explores the concept of justification through faith in Jesus Christ. Drawing on scripture, church history, and philosophical arguments, Owen provides a compelling defense of this essential doctrine of the Christian faith. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

First study in the R.E.D.S series History & exegesis of imputation Exploring the Biblical roots of sin and salvation