Once saved always saved to those who have truely repented and come to Christ in faith is security based on the promises of Christ and the father, based solely on his sons death.
OSAS to those who have not repented. but merely believe (as those James spoke of) is a false security, because they think they are ok, when they have failed to repent. and are still living in sin.
Feel free to explain verse 29 below in context to Paul's message in Romans 11th chapter as not opposing your posted quote.
Romans 11:[SUP]
24 [/SUP]For if thou wert cut out of the olive tree which is wild by nature, and wert grafted contrary to nature into a good olive tree: how much more shall these, which be the natural branches, be grafted into their own olive tree? [SUP]
25 [/SUP]For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in. [SUP]
26 [/SUP]And so all Israel shall be saved: as it is written, There shall come out of Sion the Deliverer, and shall turn away ungodliness from Jacob: [SUP]
27 [/SUP]For this is my covenant unto them, when I shall take away their sins. [SUP]
28 [/SUP]As concerning the gospel, they are enemies for your sakes: but as touching the election, they are beloved for the father's sakes.
[SUP]29 [/SUP]For the gifts and calling of God are without repentance. [SUP]
30 [/SUP]For as ye in times past have not believed God, yet have now obtained mercy through their unbelief: [SUP]
31 [/SUP]Even so have these also now not believed, that through your mercy they also may obtain mercy. [SUP]
32 [/SUP]For God hath concluded them all in unbelief, that he might have mercy upon all. [SUP]
33 [/SUP]O the depth of the riches both of the wisdom and knowledge of God! how unsearchable are his judgments, and his ways past finding out! [SUP]
34 [/SUP]For who hath known the mind of the Lord? or who hath been his counsellor? [SUP]
35 [/SUP]Or who hath first given to him, and it shall be recompensed unto him again? [SUP]
36 [/SUP]For of him, and through him, and to him, are all things: to whom be glory for ever. Amen.
I know that there is a call to repent elsewhere in scripture, but I believe at the point of salvation, the only repentance that is to be had for salvation to occur is repenting from unbelief which is why salvation is centered on believing in Him.
If you consider all the sins that a potential convert is to repent of in order to be saved, then the gospel message cannot be that simple. They would have to instruct them of everything that is sin for them to repent of for your quote to be realized as "truly repented" in order to be saved.
This is why Jesus commanded His disciples to make disciples of other believers by teaching all He has taught them and so verse 29 is true in that message that the only repentance required for salvation is from unbelief.
By having received Christ Jesus is why believers were exhorted to walk in Him to be His disciples to bear fruit and that their joy may be full as they walk in fellowship with God through Jesus Christ... a much closer walk than Enoch had with God. This is not about salvation as it is about living that reconciled relationship with God through Jesus Christ now becaise we have been bought with a price and sealed as His as our body is the temple of the Holy Spirit, and thus we are the children of God by faith in Jesus Christ.
So working for one's salvation is akin to denying Him of our rest in Him.
Hebrews 4:1Let us therefore fear, lest, a promise being left us of entering into his rest, any of you should seem to come short of it. [SUP]
2 [/SUP]For unto us was the gospel preached, as well as unto them: but the word preached did not profit them, not being mixed with faith in them that heard it. [SUP]
3 [/SUP]For we which have believed do enter into rest, as he said, As I have sworn in my wrath, if they shall enter into my rest: although the works were finished from the foundation of the world... [SUP]
7 [/SUP]Again, he limiteth a certain day, saying in David, To day, after so long a time; as it is said, To day if ye will hear his voice, harden not your hearts. [SUP]
8 [/SUP]For if Jesus had given them rest, then would he not afterward have spoken of another day. [SUP]
9 [/SUP]There remaineth therefore a rest to the people of God.
Believers need to repent from not believing in OSAS, and yet believers need to be made aware that because they are His, God will judge them by what they build on that foundation and so we are to look to Jesus as our Good Shepherd & not just as our Saviour so that our joy may e full and bear fruit as His disciples in being a witness of Him in seeking His glory in the world.