the Plymouth Brethren movement. Doctrinal differences arose in the 1840s and Müller was determined to determine the truth by the "infallible standard of the Holy Spirit". At the time, he and Craik were pastors of the Bethesda and Gideon fellowships in Bristol. Membership at Gideon was open to all believers, while only believers who had been baptised could claim full membership of Bethesda, although all believers were welcome at Communion. Müller consulted Robert C Chapman on the issue of accepting unbaptised believers, and Chapman stated that distinction should be made between unbaptised believers who "walked disorderly" and those who lived according to the Bible. Müller and Craik independently contemplated the issue and decided that unbaptised believers, who otherwise lived according to Scriptural principles, should not be denied membership. Dissension arose at Gideon regarding the presence of unbelievers at communion and the view held by some that pews were private property. Eventually, Müller and Craik withdrew from this fellowship on 19 April 1840, concentrating thereafter on the Bethesda Chapel. John Nelson Darby and Benjamin Wills Newton became opposed concerning certain matters of doctrine and a discussion was held in Plymouth on 5 December 1845. A document entitled The Principles of Open Brethren stated: "Certain tracts issued by Mr. Newton were judged to contain error regarding the nature of the Lord Jesus Christ, and the question arose whether it was sufficient to exclude from the fellowship those who held the erroneous teaching, or whether all who belonged to a gathering where the error was tolerated were to be put outside the pale, even if they themselves had not embraced it. One party, led by Mr Darby, took the latter view. Others, in particular the Bethesda Church, in which Messrs Müller and Craik ministered, refused to admit any who were convicted of holding the evil doctrine themselves but did not exclude those who came from Mr Newton's meeting. The exclusive party thereupon declined to have any further fellowship with members of the Bethesda Church or others like-minded. The latter soon came to receive the title of 'Open Brethren'." The more exclusive side of the brethren movement became known as the Exclusive Brethren and was led by Darby. Darby called on Müller in July 1849 to discuss the split, but Müller had many prior engagements and could only receive Darby for 10 minutes. It was impossible to fully discuss the problem in such a