There are lot of verses that can be used to support OSAS, such as John 10:28-30, Ephesians 2:8-9, Romans 8:38-39 (nothing can separate us from the love of God expressed through Jesus Christ, which is salvation), Jude 24. But, I dont think that was the point of this thread, if you would like to present an argument in another thread (or one of the many on this topic already here), I’d be happy to see what you have to say and weigh in.
Yet, there are many verses in support that salvation can be lost such as 1 John 5:17, Matthew 10:22, John 15:6, Hebrews 10:26 (to note, everyone in the early Church believed this verse to be talking about someone who was once saved but then lost their salvation) and 2 Peter 2:20-21. The earliest Christians believed salvation could be lost. That’s why some in the time of the early Church waited until their death bed to be baptized. The Church did not encourage this wait though.
Here are some quotes by early Church Fathers concerning salvation being lost.
- “Those who do not obey Him, but being disinherited by Him, have ceased to be His sons.” [Irenaeus, Against Heresies 4.41.3]
“We should fear ourselves, least perchance after [we have come to] the knowledge of Christ, if we do things displeasing to God, we obtain no further forgiveness of sins, but are shut out from His Kingdom. And for that reason, Paul said, ‘For if [God] spared not the natural branches, [take heed] lest He also not spare you” (Romans 11:21). [Irenaeus Against Heresies 4.27.2]
“The world returned to sin…and so it is destined to fire. So is the man who after baptism renews his sins.” [Tertullian, On Baptism, Ch. 8]
“Certain ones of those [Gnostics] who hold different opinions misuse these passages. They essentially destroy free will by introducing ruined natures incapable of salvation and by introducing others as being saved in such a way that they cannot be lost.” [Origen, De Principiis, Book 3, Ch. 1.8]
“Only let not Christ be forsaken, so that THE LOSS OF SALVATION and of an eternal home would be feared.” [Cyprian, Treatise 3, Ch. 10]
“He who sins after his baptism, unless he repent and forsake his sins, shall be condemned to Hell-fire.” [Book 2.3.VII: “What Ought to Be the Character of the Initiated.”]
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OSAS is a horrible misinterpretation of the verses you cited by later Evangelicals who theology in general was already bad.