There have always been groups of Christians who sought a deeper spirituality, something more demanding than just attending church and appearing “nice.”
In America, several groups in the mid-1800s spun off from the Methodists, whose founder, John Wesley, wrote A Plain Account of Christian Perfection. Wesley’s book claims that the Bible holds up a standard of perfection in the Christian life, so that a person can live without deliberate sin.
A National Holiness Association was formed, and there is now some overlap of holiness groups and Pentecostals (see 327). Both groups emphasize the baptism in the Holy Spirit (see 700) and the important of sanctification in the person’s life (see 681 [sanctification]).