Sorry, when a person declares themselves one of the saints, I see it as the exact same thing as OSAS. Once you claim you are of the elect, you believe you cannot fail - thus, the result is the same as OSAS. Perhaps you can explain the difference?
Regards
Proponents of the first two approaches [sic: Arminianism Lost of Salvation and OSAS] quote biblical references, but each must strain to explain away the other group's biblical data. How can an Arminian read Romans 8, then tell true believers that they may screw up and go to hell??? Then again, how can Charles Stanley read Hebrews 6 and 10 and tell unbelievers who once professed faith not to worry, that they will be saved??? Any true biblical teaching must “fit” with ALL the biblical data, without pitting one text against another and without having to explain away a single “jot or tittle” of God's inerrant Word. I believe that only the classical Calvinist model takes into account all of the biblical data.
Arminians are right when they say the Bible teaches that only those who persevere will be saved, and they’re right in accusing Antinomians of easy-believism and cheap grace. Antinomians (they wouldn’t use the term) are right in telling committed believers that they are secure in Christ and “once saved, always saved.” But both of these views are wrong is assuming that a true believer can lose his faith and fall away from Christ. Faith is “a gift of God—not by works, lest any man boast.” Paul was confident that, since Christ had begun a good work in believers, He would continue that work until completion (Phil. 1). John said that those who fell away were never really true Christians, since true believers don't leave the faith (1 John 2:19).
Scripture teaches that believers must persevere until the end, but also that believers will persevere until the end by God's grace. As the Westminster Assembly concluded, Christians might temporarily yield to Satan's temptations, even to excess, but like Peter when he denied Christ three times, God will still restore and preserve the faith of the Christian, a faith which God gave in the first place! Peter went on to be chief among the apostles!
From the section on Perseverance of the Saints
Perseverance of the Saints does not mean "once saved always saved". This corruption of the doctrine has been popular in recent years, but has never been a true representation of the doctrine. "Once saved always saved" is more keenly given the name "Perseverance of the sinner" instead of "the saint". For it teaches that man can be saved by Christ and then sin habitually, do whatever he wants, and then still "persevere to the end". Perseverance of the saints does not teach this. Perseverance of the saints teaches that once God has renewed the heart of a sinner through the application of the redemption wrought by Christ upon the cross, he will continue to be saved and show forth the fruits of that salvation. The sinner perseveres because of Christ, but he continually shows himself as one who has been changed by Christ. God has saved the individual and will sanctify him until the end when he is ultimately glorified, and in heaven. It does not mean man has a license to sin. Those who think they have a license to sin are not changed and saved by grace. They are still in sin. Those who are saved by grace and changed, desire to show forth the fruits of that salvation. God motions the heart to good work, and continues that good work to the end. John 6:37-39, "All that the Father giveth me shall come to me; and him that cometh to me I will in no wise cast out. For I came down from heaven, not to do mine own will, but the will of him that sent me. And this is the Father's will which hath sent me, that of all which he hath given me I should lose nothing, but should raise it up again at the last day."Phil. 1:6, "Being confident of this very thing, that he which hath begun a good work in you will perform it until the day of Jesus Christ:"1 Thess. 5:23-24, "And the very God of peace sanctify you wholly; and I pray God your whole spirit and soul and body be preserved blameless unto the coming of our Lord Jesus Christ. Faithful is he that calleth you, who also will do it."2 Tim. 4:18, "And the Lord shall deliver me from every evil work, and will preserve me unto his heavenly kingdom: to whom be glory for ever and ever. Amen."1 Peter 1:23, "Being born again, not of corruptible seed, but of incorruptible, by the word of God, which liveth and abideth for ever."Romans 8:29, "For whom he did foreknow, he also did predestinate to be conformed to the image of his Son, that he might be the firstborn among many brethren."phesians 2:10, "For we are his workmanship, created in Christ Jesus unto good works, which God hath before ordained that we should walk in them." monergism.com