Matt 24:13 but the one who stands firm to the end will be saved.
That would be
'descriptive' of those who truly are born again. There are those who profess to be Christians yet later walk away and were never truly saved in the first place. For example,
1 John 2:19, we read, "They
went out from us, but they were
not of us; for
if they had been of us, they would have remained with us; but they
went out from us, in order that it might be
made manifest that they all are not truly of us." The Bible is also clear that not everyone who professes to be a Christian truly is. Jesus Himself says that not everyone who says, “Lord, Lord,” will enter the kingdom of heaven. (
Matthew 7:21-22) These many people failed to do the will of God unto salvation. (Matthew 7:21; John 6:40) This reinforces the importance of testing our salvation to make sure we are in the faith (
2 Corinthians 13:5) and making our calling and election sure by continually examining our lives to make sure we don't lack these qualities mentioned in
2 Peter 1:5-10.
Jesus places the burden of action on man.
Some view "stands firm to the end" as a difficult burden that many Christians will fail to do, and the Lord will so easily allow them to slip through His hands. Yet in John 10:27-28, Jesus said -
My sheep hear My voice, (not some of them hear His voice and some of them don't hear His voice)
and I know them, (not some of them He knows and some of them He doesn't know)
and they follow Me. (not some of them follow Him and some of them don't follow Him)
And I give them eternal life, (not some of them He gives eternal life and some of them He doesn't give eternal life)
and they shall never perish; (not some of them will never perish and some of them will perish)
neither shall anyone snatch them out of My hand. (not some of them will never be snatched out of His hand and some of them will be snatched out of His hand)
The Greek for the bolded section above is ὁ δὲ ὑπομείνας, hupomeinas means “I endure, bear up against, persevere.” (Strong) and it is an Aorist, Participle, Active voice usage. The Active voice makes it a human action, because the participle reflects back to ὁ, “the one”, who is human. (cf 1Peter 2:20, Rev 3:10)
It's because of God's power and our faith that we endure. We are
kept by the power of God through faith for salvation ready to be revealed in the last time. (1 Peter 1:5) God, by His own power through the indwelling presence of the Holy Spirit, keeps or preserves the believer. God finishes what He starts. In
Philippians 1:6, the apostle Paul said, “He who began a good work in you will bring it to completion at the day of Jesus Christ.” Paul also said those who believe the gospel are
sealed with the Holy Spirit of promise, who is the guarantee of our inheritance until the redemption of the purchase possession. (Ephesians 1:13-14) In Romans 8:30, Paul finished up that verse by saying,
"and whom He justified, these He also glorified." Paul uses the past tense for a future event to stress its certainty. This is according to God's foreknowledge (Romans 8:29-30) and not fatalistic determination.
Perseverance is the biblical perspective.
When properly understood. It's not about us pulling ourselves up by our own bootstraps and persevering in our strength. It's God's power, our faith. If someone is truly saved, they are new creations in Christ. (2 Corinthians 5:17) Those who are truly born of God have received a new nature. They have
become partakers of the divine nature. (2 Peter 1:4) The change is more than just cosmetic as with "nominal" Christians/make believers.