What did Jesus mean when he said, "But they who shall endure to the end the same shall be saved?"
 Calling on the name of the Lord to be saved and enduring to the end to be saved are two different things, and we can’t have it both ways. So what was Jesus referring to when he said a person must endure to the end to be saved? The end of what? The end of our natural lives? What is it a person must endure to the end of to be saved?
We get some help from the prophet Joel concerning this seeming contradiction to the free gift of salvation based on faith and "not by works lest any should boast". Joel predicted a time would come when God’s people would be able to call on him to be saved. This was not possible in Joel’s time. After Jesus rose from the dead, on the day of Pentecost, Peter confirmed that time had finally come. The thief, hanging on a cross next to Jesus, did that very thing.
So where do the words of Jesus about “enduring to the end” come into play? How do we rightly discern between Jesus and Joel, who appear to contradict each other?
The conflict is resolved when we understand that, in this verse, Jesus is not referring to the same time Joel referenced but rather to the Time of Jacob’s Trouble also known as The Great Tribulation. Joel predicted that time period as well, but that time has not come yet.
We are presently living in the time Peter heralded on that long ago Day of Pentecost, which initiated the Dispensation [or Age] of Grace—the time of Christ in You—by the Holy Spirit descending and remaining (taking up residence within the bodies of Believers). Later on, the apostle Paul confirmed that our bodies are now the Temple of God.
The time of “Christ in You” had its beginning on the first Feast of Pentecost following the resurrection of Christ, commonly known among Christians, as The Day of Pentecost. This Feast of the Lord is also known as Shavuot, the Feast of Weeks.
Shavuot is a harvest feast, and this is significant. Because, the Day of Pentecost/Shavuot kicked off the greatest age of harvest this world has ever known or ever will know. At the time of this writing, we are still living in the time of God’s harvest…and that harvest is saved souls, won to Christ and supernaturally translated from the Kingdom of Darkness into the Kingdom of His Dear Son.
There are three harvest feasts that represent and foretell the "Accepted Time," the "Time of Favor, "Age of Grace" (the time we are living in as this is being written), 1.) First-fruits 2.) Shavuot/Pentecost 3.) Trumpets
The three stages of harvest (soul winning and in-gathering) these feasts predict and represent are 1.) Jesus the First Fruits from the dead 2.) Shavuot/Pentecost, which is the main harvest (souls saved) following the First Fruits. Paul called this the Time of Favor. This is the time Joel predicted that calling on the Name of the Lord for salvation would be possible 3.) Rosh Hashana; the Feast of Trumpets also called the Feast of In-Gathering, consummates the main harvest with the sound of a trumpet. Those "In Christ" will be gathered. The dead in Christ shall rise first, then the living will be changed and caught up to meet the Lord in the air.
After that, come the gleanings. This happens during the Feast of the Lord called the Day of Atonement. It is during the time this feast predicts and represents, that enduring to the end will be the only way to be saved. It was to this time, The "Time of Trouble" that follows the Time of Favor, that Jesus referred to when he said one must "endure to the end" to be saved.
The harvest of Shavuot began over 2000 years ago, when Jesus said “Look! The fields are already ripe for the harvest!”
The great harvest of the past 2000 years, will be gathered in at the Resurrection of the Dead in Christ and the Catching Up those living IN HIM at the time of his coming in the air 1 Thessalonians 4:16-18. This is predicted in the *Feast of the Trumpets—Rosh Hashanah—which is a two day feast.
After that, come the gleanings during the Time of Jacob’s Trouble, the Great Tribulation—the time Jeremiah predicted people would say “The summer is over; the harvest is ended, and we are not saved.”
When Jesus said, “They that endure to the end will be saved,” he was referring to those left behind when the main harvest of the Feast of Weeks is finally gathered in at the Feast of Trumpets (resurrection/rapture).
At the time of this writing, we are living in the time of “Christ in You,” the “Age of Grace,” and anyone can call upon the name of the Lord and receive forgiveness of sins and Eternal Life—be saved Romans 10:9-13. Those who do not call upon the Name of the Lord during the time of “Christ IN You,” and are alive during the Time of Jacob’s Trouble (foretold by the Feast of Lord, the Day of Atonement), must “endure to the end” at which time, those who have endured and are still alive will experience a dramatic deliverance. The gleanings (those who are left after the main harvest) will be gathered in after the main harvest is completed.
*For more study on the Feasts of The LORD and what they mean to both Jew and Gentile alike, The book, REDEMPTION: Bible Prophecy Simplified, by this author, is a detailed study of Bible prophecy based on the Feasts of the Lord . This writer also calls them, the “Prophetic Feasts of Hope.” There are seven of them, and they are all about the HOPE that is in us, God’s REDEMPTION of our bodies, souls, and the earth, through his risen Son, Jesus the Messiah.