Puritanism was at heart a spiritual movement, passionately concerned with God and godliness. It began in England with William Tyndale the Bible translator, Luther’s contemporary, a generation before the word “Puritan” was coined, and it continued till the latter years of the seventeenth century, some decades after “Puritan” had fallen out of use. . . . Puritanism was essentially a movement for church reform, pastoral renewal and evangelism, and spiritual revival. . . . The Puritan goal was to complete what England’s Reformation began: to finish reshaping Anglican worship, to introduce effective church discipline into Anglican parishes, to establish righteousness in the political, domestic, and socio-economic fields, and to convert all Englishmen to a vigorous evangelical faith.

–J.I. Packer, A Quest for Godliness, quoted by John Piper in Contending for Our All.