Also see Charles Hodge's Systematic Theology, Vol. 3, Ch. 18, "Santification", "7. Perfectionism", and Herman Bavinck's Reformed Dogmatics, Vol. 4, "The Perfectionist Heresy".)
Wesley’s doctrine of entire sanctification by the free will of man fits with his teaching of justification by the free will of man, though not with articles 9 and 15 of the Thirty-Nine Articles. He was already teaching perfectionism in the “Holy Club” at Oxford University in 1733 (p. 38). By 1739-1740, through a dispute with the Moravians, he reached the point were he would “castigate any who denied perfection as antinomians who were happy to accept their sinfulness” (p. 88). This was a doctrine in which Wesley “passionately believed” (p. 156). Tomkins sees perfectionism as a great “preoccupation” of Wesley’s, “the very heart” of his “spirituality.” “Faith, Wesley said, was the door of religion; holiness, ‘religion itself’” (p. 197). Thus he “preached” entire sanctification and “fought for it at length” (p. 156).