The idea that the Holy Spirit uses the believer like a glove or wears him as a suit does not do justice to the believer as a person. Union with Christ does not rob the believer of his individuality and meaningful activity. The Spirit does not come to negate humanity but to restore it and to call all the human faculties into active exercise. In union with Christ, the human partner is truly free. Although empowered and motivated by Christ, the life of holiness is really his own.
Sanctification can easily slip into a refined pantheism when the personhood of the believer is lost.
The act of the creature becomes indistinguishable from the act of the Creator. Deity is said to do everything the believer appears to do. Some teach that the deeds of surrendered lives are really the deeds of God Himself. The distinction between Creator and creature is lost. This happens in most kinds of perfectionism.