According to advocates of Eternal Security, how can one be assured that they truly belong to the saints who will persevere to the end?

> [Matthew 24:13 NASB] But the one who endures to the end is the one who will be saved. > [Revelation 14:12 NASB] Here is the perseverance of the saints who keep the commandments of God and their faith in Jesus. > [2 Timothy 4:7-8 NASB] 7 I have fought the good fight, I have finished the course, I have kept the faith; 8 in the future there is reserved for me the crown of righteousness, which the Lord, the righteous Judge, will award to me on that day; and not only to me, but also to all who have loved His appearing. If perseverance is the mark of the true believer, how do those who hold to Eternal Security know with certainty that they are among this group? How can they be sure they are not deceiving themselves (or being deceived by the enemy), mistaking themselves for good soil when in reality they may be rocky ground that will eventually fall away? After all, no one is omniscient—only God knows the future. A person in their twenties or thirties cannot know with certainty whether they might later apostatize in their fifties, sixties, or seventies. Or can they?