The Holiness movement involves a set of beliefs and practices which emerged from 19th-century Methodism. A number of Evangelical Christian denominations, parachurch organizations, and movements emphasize those beliefs as central doctrine. The movement is Wesleyan-Arminian in theology, and is defined by its emphasis on John Wesley's doctrine of a second work of grace leading to Christian perfection. As of 2015[update] Holiness-movement churches had an estimated 12 million adherents.
Holiness adherents believe that the "second work of grace" (or "second blessing") refers to a personal experience subsequent to regeneration, commonly called "salvation," in which the believer is cleansed of the tendency to commit sin. This experience of "entire sanctification" enables the believer to live a holy life, and ideally, to live entirely without willful sin.
Holiness groups believe the moral aspects of the law of God are pertinent for today, and so expect their adherents to obey behavioral rules—for example, many groups have statements prohibiting the consumption of alcohol, participation in any form of gambling, and entertainments such as dancing and movie-going. This position does attract opposition from certain evangelicals, who charge that such an attitude refutes or slights Reformation (particularly Calvinist) teachings that the effects of original sin remain even in the most faithful of souls.
Though it became a multi-denominational movement over time and was furthered by the Second Great Awakening which energized churches of all stripes, the Holiness movement has its roots in Wesleyanism.