A further thought: To OSAS believers: What if a hard-hearted person, who "has no time for God", hears the gospel and believes it - in the sense that he believes it to be true, without having any loyalty to godly things. He then curses God and rebelliously goes on a continuous ungodly way of life, having contempt for God 'til his last day and finally dies just after cursing God.
Would this man be saved?
Yes. The Bible is very clear about this. These kinds of questions suggest that OSAS believers don't have any clear evidence from Scripture to back up their beliefs. And that would be quite wrong.
I'll give you the 2 best arguments from Scripture about eternal security.
Jesus taught in John 3:15,16, 5:24, 6:40 and 47 and John in 1 John 5:13, that believers HAVE or POSSESS eternal life. So, that means WHEN a person becomes a believer, since ALL believers possess eternal life.
Then, in John 10:28 Jesus said that recipients of eternal life shall never perish.
So, it couldn't be any more clear that once given eternal life, which is WHEN one believes, Jesus SAYS they shall never perish.
However, there is another passage that clearly teaches eternal security.
2 Cor 1:22 - set his seal of ownership on us, and put his Spirit in our hearts as a deposit, guaranteeing what is to come.
2 Cor 5:5 - Now the one who has fashioned us for this very purpose is God, who has given us the Spirit as a deposit, guaranteeing what is to come.
Hm. Both verses end with the exact same words, "guaranteeing what is to come". And both verses base this guarantee on the Holy Spirit as a DEPOSIT.
So, what does all this mean? What is guaranteed, and how does one receive this deposit?
Well, glad you asked.
Paul explained all this in Eph 1:13,14
13 And
you also were included in Christ when you heard the message of truth, the gospel of your salvation.
When you believed,
you were marked in him with a seal, the promised Holy Spirit,
14 who is a deposit guaranteeing our inheritance until the redemption of those who are God’s possession—to the praise of his glory.
I've color coded these verses to help follow and understand all that Paul meant.
The red words teach that on the basis of believing in Christ the believer is "included IN Christ". This is called "positional truth". Every believer shares in all that Christ has because every believer is IN Christ.
The blue words teach that on the basis of believing in Christ, God marks the believer with a SEAL, which is the promised Holy Spirit. This is when the indwelling of the Holy Spirit begins; at the moment of faith in Christ.
The green words teach eternal security because the believer's inheritance (as a child of God per John 1:12 and Gal 3:26) is GUARANTEED.
And then the purple words gives Paul's explanation WHEN that GUARANTEED INHERITANCE is realized; until the redemption of those who are God's possession.
So, just who are "God's possession"? Those who have been MARKED in him with a seal.
IOW, those who have the indwelling Holy Spirit, which is on the basis of faith in Christ, ARE God's possession.
And the believer's inheritance is GUARANTEED.