In Christianity, an elder is a person who is valued for wisdom and holds a position of responsibility and authority in a Christian group. In some Christian traditions (e.g., Eastern Orthodoxy, Roman Catholicism, Anglicanism, Methodism) an elder is an ordained person who serves a local church or churches and who has been ordained to a ministry of word, sacrament and order, filling the preaching and pastoral offices. In other Christian traditions (e.g., Presbyterianism, Churches of Christ, Plymouth Brethren), an elder may be a lay person serving as an administrator in a local congregation, or be ordained and serving in preaching (teaching during church gatherings) or pastoral roles. There is a distinction between ordained elders and lay elders. The two concepts may be conflated in everyday conversation (for example, a lay elder in the Baptist tradition may be referred to as "clergy", especially in America). In non-Christian world cultures the term elder refers to age and experience, and the Christian sense of elder is partly related to this. Elders are mentioned in a number of New Testament passages. Individuals such as James had a significant role in the Jerusalem church and the Council of Jerusalem. In reference to churches in Antioch, Pisidia, Iconium, Lystra and Derbe, Paul appoints elders as a key step in organizing a new church and instructs Titus to appoint others. Paul spoke directly to the elders in Acts and warned them to "be on guard for themselves and for all the flock, among which the Holy Spirit has made them overseers, to shepherd the church of God which He purchased with His own blood."[Acts 20:28] The book of Revelation identifies twenty-four elders with white robes and golden crowns on their heads seated on thrones around the One seated on the throne (Rev. 4:4, 10–11). The Christian office of "elder" is drawn from the word's various uses in the Bible. In many instances, particularly in the Old Testament, it has reference to the older men in a tribe, usually entrusted with the governmental affairs, whose counsel was frequently sought because of their age and experience.