John Wesley Explains Christian Perfection

Christian perfection, therefore, does not imply (as some men seem to have imagined) an exemption either from ignorance, or mistake, or infirmities, or temptations. Indeed, it is only another term for holiness. They are two names for the same thing. Thus, every one that is holy is, in the Scripture sense, perfect. Yet we may, Lastly, observe, that neither in this respect is there any absolute perfection on earth. There is no perfection of degrees, as it is termed; none which does not admit of a continual increase.

—Sermon 40, Christian Perfection