Wesleyan theology, otherwise known as Wesleyan–Arminian theology, or Methodist theology, is a theological tradition in Protestant Christianity based upon the ministry of the 18th-century evangelical reformer brothers John Wesley and Charles Wesley. More broadly it refers to the theological system inferred from the various sermons (e.g. the Forty-four Sermons), theological treatises, letters, journals, diaries, hymns, and other spiritual writings of the Wesleys and their contemporary coadjutors such as John William Fletcher.
In 1736, the Wesley brothers travelled to the Georgia colony in America as Christian missionaries; they left rather disheartened at what they saw. Both of them subsequently had "religious experiences", especially John in 1738, being greatly influenced by the Moravian Christians. They began to organize a renewal movement within the Church of England to focus on personal faith and holiness. John Wesley took Protestant churches to task over the nature of sanctification, the process by which a believer is conformed to the image of Christ, emphasizing New Testament teachings regarding the work of God and the believer in sanctification.
Wesleyan–Arminian theology, manifest today in Methodism (inclusive of the Holiness movement), is named after its founders, John Wesley in particular, as well as for Jacobus Arminius, since it is a subset of Arminian theology. The Wesleys were clergymen in the Church of England, though the Wesleyan tradition places stronger emphasis on extemporaneous preaching, evangelism, as well as personal faith and personal experience, especially on the new birth, assurance, growth in grace, entire sanctification and outward holiness. In his Sunday Service John Wesley included the Articles of Religion, which were based on the Thirty-nine Articles of the Church of England, though stripped of their more peculiarly Calvinistic theological leanings. Wesleyan theology asserts the primary authority of Scripture and affirms the Christological orthodoxy of the first five centuries of church history.