Christian perfection is the name given to a process of achieving spiritual maturity or perfection; theological concepts within many sects of Christianity. The ultimate goal of this process is union with God characterized by pure love of God and other people as well as personal holiness or sanctification. Other terms used are entire sanctification, perfect love, the baptism with the Holy Spirit, the indwelling of the Holy Spirit, baptism by fire, the second blessing, and the second work of grace.
Understandings of the doctrine of Christian Perfection vary widely between Christian traditions, though these denominational interpretations find basis in Jesus' words recorded in Matthew 5:48, "Be ye therefore perfect, even as your Father which is in heaven is perfect" (King James Version) but not Matthew 19:21, "Jesus said unto him, If thou wilt be perfect, go and sell that thou hast, and give to the poor, and thou shalt have treasure in heaven: and come and follow me."
Some protestant denominations, such as the Lutheran and Reformed churches, reject the possibility of Christian perfection in this life as contrary to the doctrine of salvation by faith alone, holding that deliverance from sin occurs in glorification. Contrasting to all, Christian Science teaches that as man is made in God's image and likeness (Genesis 1:27), "The great spiritual fact must be brought out that man is, not shall be, perfect and immortal"
The Roman Catholic Church teaches that Christian perfection is to be sought after by all of the just (righteous). Eastern Orthodoxy situates Christian perfection as a goal for all Christians.
Perfection is a prominent doctrine within the Methodist tradition, in which it is referred to as Christian perfection or entire sanctification. Traditional Quakerism uses the term perfectionism and teaches that it is the calling of a believer.
The terms "perfect" and "perfection" are drawn from the Greek teleios and teleiōsis, respectively. The root word, telos, means an "end" or "goal".