Mark 9:39 Commentary - Whedon's Commentary on the Old and New Testaments
39. That can lightly speak evil of me If he uses my name he must believe that mine is a divine name. If he can work wonders by it, his faith must be both true and great. If God enable him to perform miracles, the divine obligation is upon him. He therefore cannot speak contemptuously of the name by faith in which he achieves miracles of mercy. He win never pronounce I am an impostor, or join the scribes in saying that I cast out devils through the prince of devils.
It cannot be denied that this furnishes a strong reproof to bigots who are ready to deny the Christian or the churchly name to those who are not of their own organization. Where those who differ from us do not endanger the fundamentals of repentance towards God and faith in the Lord Jesus Christ, we must be very cautious how we forbid them because they follow not us. We may love our own doctrines, discipline, usages, and denomination, we may defend them at the proper time with firmness and boldness; but let us not be unjust to the piety and the zeal in the cause of Christ and the good of mankind, which exist in other denominations of Christians.
Consult other comments:
Mark 9:39 - The Greek Testament
Mark 9:39 - Albert Barnes' Notes on the Bible
Mark 9:39 - Calvin's Complete Commentary
Mark 9:39 - The Cambridge Bible for Schools and Colleges
Mark 9:39 - Adam Clarke's Commentary and Critical Notes on the Bible
Mark 9:39 - Commentary on the Holy Bible by Thomas Coke
Mark 9:39 - Companion Bible Notes, Appendices and Graphics
Mark 9:39 - Expository Notes of Dr. Constable (Old and New Testaments)
Mark 9:39 - Ellicott's Commentary for English Readers (Old and New Testaments)
Mark 9:39 - The Expositor’s Greek Testament by Robertson
Mark 9:39 - Garner-Howes Baptist Commentary
Mark 9:39 - John Gill's Exposition of the Entire Bible
Mark 9:39 - Gnomon of the New Testament
Mark 9:39 - Henry Alford's Greek Testament
Mark 9:39 - Jamieson, Fausset and Brown's Commentary Critical and Explanatory on the Whole Bible
Mark 9:39 - Commentary Series on the Bible by Peter Pett
Mark 9:39 - Robertson's Word Pictures in the New Testament
Mark 9:39 - A Popular Commentary on the New Testament
Mark 9:39 - Scofield Reference Bible Notes
Mark 9:39 - John Trapp's Complete Commentary (Old and New Testaments)
Mark 9:39 - The Treasury of Scripture Knowledge
Mark 9:39 - Whedon's Commentary on the Old and New Testaments
Whedon's Commentary on the Old and New Testaments

Daniel D. Whedon (1808-1885) was a prominent university professor, theologian, and author. He served as Professor of Ancient Languages at Wesleyan University in Connecticut; as Professor of Rhetoric at the University of Michigan; and as editor of the Methodist Quarterly Review from 1856 to1884. He authored numerous books including Commentary on the New Testament (New York: Carlton & Porter, 1860); Commentary on the Old Testament (New York: Nelson & Phillips, 1873); What is Arminianism? (Toronto: W. Briggs, 1879); and Essays, Reviews, and Discourses (New York: Phillips & Hunt, 1887).