Eternal security:
Salvation is purely of grace, for those who are spiritually born of the Spirit (Jn. 3:2-7) by effectual penitent, heart-purifying, regenerating, justfying faith (Acts 10:43-47, 15:7-9) in the Divine Son of God and Lord Jesus, sent be the Father to be the Savior of the world. (1 Jn. 4:14) Who saves sinners by His sinless shed blood.
And which faith is imputed for righteousness, (Romans 4:5) for the believer, who is completely forgiven of all sins (Colossians 2:13) being washed, sanctified, and justified in the name of the Lord Jesus, and by the Spirit of our God, (1 Corinthians 6:11) and "accepted in the Beloved" and positionally seated with Him in Heaven, Ephesians 1:6, 2:6; cf. Phil. 3:21) and translated into His spiritual kingdom, (Colossians 1:13, 14; cf. John 18:36) and baptized by the Spirit of Christ into His body, 1Cor. 12:2) the one true church (Colossians 1:18) to which He is married. (Ephesians 5:23-32)
And which justificatory faith results in following the Lord, (Jn. 10:27, 28; Romans 8:14) (which is to formally begin with being baptized: Acts 2:38-47, 8:12, 36, 37) as the Lord enables and motivates the believer by His indwelling Spirit to follow their Lord, (Philippians 2:13) and to repent when convicted of not obeying the Lord. (2 Samuel 12:13-14; Ps. 51:3 Ps. 32:3-6; Mt. 6:19; 1 Jn. 1:8-10; 2 Corinthians 7:9-10; James 5:19-20; cf. 1 Tim. 1:19) For whatever is not consistent with actual belief in the Lord Jesus and thus what He requires (in Scripture as well via conviction of conscience), is sin. (Romans 14:23)
And those who die in that obedient faith will go to be forever with Him at death or His return (Phil 1:23; 2Cor. 5:8 [“we”]; Heb, 12:22,23; 1Cor. 15:51ff'; 1Thess. 4:17) In contrast to those who were never born of the Spirit or who terminally fall away. (Gal. 5:1-4; Heb. 3:12, 10:25-39)
As regards Eternal versus Conditional Security, the latter is consistent with faith in the God of the Bible, in which man is unable to keep himself saved on the basis of the merit of his works, but neither does God’s power mean that He will prevent regenerated souls from choosing to respond negatively to what He so many times warns believers, as believers against.
Instead, Conditional Security is believing that saving faith is an obedient faith, and thus God exhorts believers, "Let us hold fast the profession of our faith without wavering; (for he is faithful that promised,) (Hebrews 10:22-23) and warns the same against departing from God, falling from grace, etc., and becoming reprobate and its damnable consequences. Which would be merely bluffing if it were not possible.
For the Lord clearly warns believers against
► forsaking the Lord and being finally forsaken by Him (2 Chron.15:2); in all cases, if without repentance), as is indicated by those such as king Asa cf. (2 Chron. 14:2-5, 15:12, 16:1-12) + at times almost the whole of God’s OT people;
► and of not abiding in the Vine and being cast off, (John 15:6)
► + of condemnation by living after the flesh, (Rom. 8:13)
► of becoming reprobate, (1 Cor. 9:27) ► and of not effectually remembering, of not continuing in the faith they believed, (1 Cor. 15:2),
► and being at risk of having received the grace of God in vain, (2 Co. 6:1);
► of not continuing in the faith by which they received the Spirit and deliverance, thereby making Christ of no salvific effect, of no profit, (Gal. 3:2, 3; Gal. 4:7-9; Gal. 5:1-4)
► and of failing the test of persecution as young converts, thus rendering the labor of the evangelist to be in vain, (1 Thes. 3:2-5)
► and of converts being denied by the Lord if they deny Him, (2 Tim. 2:11-12) ► and of holy believers developing an evil of unbelief in departing from the living God, (Heb. 3:12);
► + of believers impenitently willfully sinning, forsaking the faith and fellowship, and thus having damnation as God judges His people, (Heb. 10:25-39)
► + of believers being sinners, as adulterous friends with the world and grieving the Spirit, and of saving wayward brethren (contextually) from death by turning such from his error, (James 4:4, 5, James 5:19-20)
► and how one can avoid falling from grace by diligently growing thereby, unlike those who are not mindful of so great salvation, of being purged from their old sins, (2 Pt. 1:1-10)
► and that there is a sin unto death among brethren; (1 Jn. 5:16)
► which James likewise refers to^, and would be the final result of not heeding the exhortations in believes such as to “holy brethren,”(Heb. 3:1)
►Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God. But exhort one another daily, while it is called To day; lest any of you be hardened through the deceitfulness of sin. For we are made partakers of Christ, if we hold the beginning of our confidence stedfast unto the end; (Heb. 3:12-14)
The assurance that the Word of God provides against falling from grace is by adding to one’s faith virtue, knowledge, temperance; patience; godliness, brotherly kindness and charity. “But he that lacketh [pareim mÄ“ = present here, not] these things is blind, and cannot see afar off, and hath forgotten that he was purged from his old sins. (2 Peter 1:8-9) Wherefore the rather, brethren, give diligence to make your calling and election sure: for if ye do these things, ye shall never fall.” (2 Peter 1:1-10)
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The following is in response to a post at the The Christian Diarist blog entitled, Does the Bible Teach ‘Once Saved, Always Saved’? This was in response to a sermon that he heard which taught that even if a Christian renounced the faith - in this case declaring himself an atheist - yet he is secure for all eternity since he one time gave his life to the Lord.
Thus there are two extremes to be avoided in gospel preaching, that of requiring the candidate to quit all sin in order to come to Christ, while the other extreme fosters conversions that do not result in manifest overall change, as their labor tends towards coaxing sinners into saying a "sinner's prayer” out of intellectual assent. If conversion was treated like marriage, the latter school would be like a father coaxing a man to assent to marry his daughter out of self interest, when he actually shows little interest in her or heart desire for what marriage offers.
The following is the rest of my response to a defense of OSAS, though it does not place Templeton in the camp of the elect but relegates him to never having been regenerated. However I deal with both here in arguing that Scripture warns of converts denying the faith and forfeiting what faith appropriated if they die unrepentant.