To be born again, or to experience the new birth, is a phrase, particularly in evangelicalism, that refers to a "spiritual rebirth", or a regeneration of the human spirit. In contrast to one's physical birth, being "born again" is distinctly and separately caused by the operation of the Holy Spirit, and it occurs when one surrenders their life to Christ. It is a core doctrine of the denominations of the Anabaptist, Moravian, Methodist, Baptist, Plymouth Brethren and Pentecostal Churches along with all other evangelical Christian denominations. All of these Churches strongly believe Jesus's words in the Gospels: "You must be born again before you can see, or enter, the Kingdom of Heaven". Their doctrines also mandate that to be both "born again" and "saved", one must have a personal and intimate relationship with Jesus Christ.