He is chiefly remembered for writing a commentary on the Bible which took him 40 years to complete and which was a primary Methodist theological resource for two centuries.
That commentary, published as: "The New Testament of our Lord and Saviour Jesus Christ. The text carefully printed from the most correct copies of the present Authorized Version. Including the marginal readings and parallel texts. With a Commentary and Critical Notes. Designed as a help to a better understanding of the sacred writings. By Adam Clarke, LL.D. F.S.A. M.R.I.A. With a complete alphabetical index. Royal Octavo Stereotype Edition." [In six volumes of approximately 1,000 pages each] "New York, Published by J. Emory and B. Waugh, for the Methodist Episcopal Church, at the conference office, 13 Crosby-Street. J. Collord, Printer. 1831.", may be the most comprehensive commentary on the Bible ever prepared by one man. By himself he produced nearly half as much material as the scores of scholars who collaborated on the twelve-volume The Interpreters’ Bible. His commentary, particularly that on Revelation, identified the Catholic Church with the antichrist and bordered on anti-semitic, as illustrated by the following quote:
“The Jewish philosophy, such as is found the Cabala, Midrashim, and other works, deserves the character of vain deceit, in the fullest sense and meaning of the words. The inspired writers excepted, the Jews have ever been the most puerile, absurd, and ridiculous reasoners in the world. Even Rabbi Maimon or Maimonides, the most intelligent of them all, is often, in his master-piece, the Moreh Nevuchim, the teacher of the perplexed, most deplorably empty and vain.” A.C. 1831 VI p. 486
As a theologian, Clarke reinforced the teachings of Methodist founder John Wesley. He taught that the Bible provides a complete interpretation of God's nature and will. He considered Scripture itself a miracle of God's grace that "takes away the veil of darkness and ignorance." With such an understanding, Clarke was first and foremost a biblical theologian, often uneasy with purely systematic approaches to theology.
Clarke followed Wesley in opposing a Calvinistic scheme of salvation, preferring instead the Wesleyan-Arminian positions regarding predestination, prevenient grace, the offer of justification to all persons, the possibility of entire sanctification, and assurance of salvation.
Perhaps his most controversial position regarded the eternal Sonship of Jesus. Clarke did not believe it biblically faithful to affirm this doctrine, maintaining that prior to the Incarnation, Jesus was "unoriginated." Otherwise, according to Clarke, he would be subordinate to God and therefore not fully divine. This was important to Clarke because he felt that Jesus' divinity was crucial to understanding the atonement.
Clarke's view was opposed by many Methodists, notably Richard Watson. Watson and his allies argued that Clarke's position jeopardized the integrity of the doctrine of the Trinity. Clarke's christological view was rejected in large part by Methodist theologians in favor of the traditional perspective.
- Lewis Topographical Dictionary of Ireland (1837)
- "The New Testament of our Lord and Saviour Jesus Christ. The text carefully printed from the most correct copies of the present Authorized Version. Including the marginal readings and parallel texts. With a Commentary and Critical Notes. Designed as a help to a better understanding of the sacred writings. By Adam Clarke, LL.D. F.S.A. M.R.I.A. With a complete alphabetical index. Royal Octavo Stereotype Edition." [In six volumes of approximately 1,000 pages each] "New York, Published by J. Emory and B. Waugh, for the Methodist Episcopal Church, at the conference office, 13 Crosby-Street. J. Collord, Printer. 1831
- Adam Clarke quoted in Thomas Langford, Practical Divinity: Theology in the Wesleyan Tradition. (Nashville: Abingdon, 1983), p. 56.
- The Christian Prophet and His Work by Adam Clarke (ISBN 0-88019-406-5)
- Christian Theology by Adam Clarke (ISBN 0-88019-261-5)
- Commentary on the Bible by Adam Clarke (ISBN 0-529-10634-5)
- Practical Divinity: Theology in the Wesleyan Tradition (1983) by Thomas Langford (ISBN 0-687-07382-0)
- Adam Clarke, Controversialist: Wesleyanism and the Historic Faith (1975) by Ian Sellers (ISBN 0-900798-08-4)
- When Adam Clarke Preached, People Listened: Studies in the Message and Method of Adam Clarke's Preaching (1981) by Wesley Tracy (ISBN 0-8341-0714-7)
- Sellers, Ian. "Clarke, Adam". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/5483. (Subscription or UK public library membership required.)
- Some of Clarke's writings - The Life of Adam Clarke, Entire Sanctification, and Adam Clarke's Bible Commentary
- Adam Clarke's O.T. & N.T. Commentary
- Archival material relating to Adam Clarke listed at the UK National Archives