Only those that endure until the end will gain the promised salvation.
The verse is speaking about a physical deliverance that will happen at the end of the great tribulation. After all, were are told that those who are believing now will not perish:
"For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life" (Jn.3:16).
No one gains more than a promise of salvation prior to the return of Jesus.
So the lady to whom the Lord Jesus addressed these words was not saved?:
"And he said unto her, Thy sins are forgiven. And they that sat at meat with him began to say within themselves, Who is this that forgiveth sins also? And he said to the woman, Thy faith hath saved thee; go in peace" (Lk.7:48-50).
We are chosen of God when He examines us and predicts that we are able to attain salvation.
1 Peter 1:2
Elect according to the foreknowledge of God the Father, through sanctification of the Spirit, unto obedience and sprinkling of the blood of Jesus Christ: Grace unto you, and peace, be multiplied.
Which Greek expert can you cite who says that the Greek word translated "foreknowledge" means "prediction"?
But in order to gain the salvation, we must be counted as worthy of God.
22 Thessalonians 1:11
Wherefore also we pray always for you, that our God would count you worthy of this calling, and fulfil all the good pleasure of his goodness, and the work of faith with power:
So believing is not enough to be saved even though the Lord Jesus said that those who "believe" have been given eternal life and will not be judged?:
"Very truly I tell you, whoever hears my word and believes him who sent me has eternal life and will not be judged but has crossed over from death to life" (Jn.5:24).
The end for the ones that have been called and chosen who fail to overcome will be worse.
Those that deny the eternal security of the Christian ask, "If this passage refers to people who have eternal security then how would it have been better for them NOT to have known the way of righteousness?"
Let us look at the following verse:
"For it had been better for them not to have known the way of righteousness, than, after they have known it, to turn from the holy commandment delivered unto them" (2 Pet.2:21).
These people were obviously saved because they knew "the way of righteousness", which is by the law of the Spirit of life in Jesus Christ:
"For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death...That the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit" (Ro.8:2,4).
They knew the "way of righteousness" was by denying "worldy lusts" and "ungodliness":
"Teaching us that, denying ungodliness and worldly lusts, we should live soberly, righteously, and godly, in this present world" (Titus 2:12).
However, after being saved and knowing the "way of righteousness" they turned away from the "holy commandment". The Greek word translated "commandment" means
"of the whole body of moral precepts of Christianity...2 Pet. ii. 21" (
Thayer's Greek English Lexicon).
The words of Peter at 2 Peter 2:20-21 are speaking of some Christians who were born again and they are described as "those who are just escaping from those who live in error" (v.18) and as having escaped the pollutions of the world (v.20). However,some false teachers had "promised them liberty" (v.19) and allured them through the lusts of their flesh into believing a false teaching in regard to "morals". This false teaching is probably the same thing that Paul refers to at Romans 3:8--that the Christians were falsely accused of teaching "Let us do evil that good may come." This was a false teaching that said that the more we sin then the more that grace will abound, and was based on a false interpretation of the words at Romans 6:1-
"shall we continue in sin that grace may abound?"
So the people who had escaped moral pollution by the knowledge of the gospel as well as the moral teachings that urge the Christian to keep himself "holy" had been deceived into believing that they should continue to sin so that grace would abound even more. They returned to their old way of life (v.22). They are worse off now and it would have been better if they had never even heard the moral commandments at first because now they have no excuse for their behavior.
But the wiords here stand and cannot be denied:
"For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life" (Jn.3:16).