{{Christianity}}'''Eternal security''' is the doctrine of unconditional '''eternal salvation''' as an irrevocable gift of salvation from [[God]] through [[Jesus Christ|Christ]] as Savior. [[Reformed Churches|Reformed Christianity]]/[[Calvinism]] commonly refers to this doctrine as the "perseverance of the saints".
It is also called, "'''Once saved, always saved'''", a nickname for the belief that Christians are eternally saved from [[sin]] and damnation to [[hell]] once and for all eternally by faith alone, ''[[sola fide]]'', by believing in Jesus Christ as one's own personal Savior, without any merit or any earning of [[salvation]] by anything the repentant sinner can do, and that once it has been given and received by accepting Christ "into your heart" as Lord and Savior, salvation and eternal glory in heaven with God cannot ever be lost or forfeited or revoked, even if one later renounces Christianity and/or engages in a grossly immoral lifestyle. It is also informally called "'''Assurance'''". See [https://www.biblegateway.com/passage/?search=Romans+8%3A38-39&version=NKJV Romans 8:38-39]; [https://www.biblegateway.com/passage/?search=Romans+10%3A10-11&version=NKJV 10:10-11]; [https://www.biblegateway.com/passage/?search=Hebrews+6%3A11-12&version=NKJV Hebrews 6:11-12].
==Supporting arguments==