In Christianity, born again refers to a "spiritual rebirth" (regeneration) of the human person, contrasted with the physical first birth everyone experiences. The origin of the term "born again" is the New Testament: "Jesus replied, 'Very truly I tell you, no one can see the kingdom of God without being born again.'"[Jn 3:3 TNIV][1] It is a term associated with salvation in Christianity.
Throughout most of Christian history, to be "born again" was understood as spiritual regeneration via the sacrament of baptism. This is still the understanding in Roman Catholicism and Eastern Orthodoxy. However, beginning with the Reformation, being born again[2] is predominantly understood by Protestants (Episcopalians and Lutherans are two notable exceptions to this understanding) to be an experience of conversion symbolized by water baptism, rooted in commitment to one's personal faith in Jesus Christ for salvation. A metaphorical rebirth occurs when a person accepts Jesus as the Messiah and receives the Holy Spirit. Within evangelical Protestantism, the term "born again" has come to be associated with a new concept, an experience of conversion, defined as mental assent to the acceptance of Jesus Christ as one's personal Saviour