It would be impossible if one had God's foreknowledge and could infallibly predict who the elect are, who will persevere and who will not, remaining in obedience, remaining in subjugation, abiding in faith, hope, and love, doing His will. Believing oneself to be saved isn't the same as ultimately being saved.
Not so - Jeremiah correctly predicted that the New Covenant to come would involve the fear of Him indwelling believers to prevent them falling away.
It is not for us to judge who the saved are, but those who are saved are sealed by the Fear of Him.
In this New Covenant, knowing that man can not attain to the Holiness of God, He prevents them from sinning to the point of loosing salvation by His indwelling fear.
This truth brings great peace and assurance to the saved.
We can, however, loose out on the blessings of the kingdom by straying from Him.
This results in missing out on Kingdom blessings in this life and eternal rewards in the next.
I quote again this passage to read...
Jer 32:40
“I will make an everlasting covenant with them that I will not turn away from them, to do them good; and
I will put the fear of Me in their hearts so that they will not turn away from Me..."
and
Jer 31:31 following
“Behold, days are coming,” declares the LORD, “when I will make a new covenant with the house of Israel and with the house of Judah, not like the covenant which I made with their fathers in the day I took them by the hand to bring them out of the land of Egypt, My covenant which they broke, although I was a husband to them,” declares the LORD.
“But this is the covenant which I will make with the house of Israel after those days,” declares the LORD, “I will put My law within them and on their heart I will write it; and I will be their God, and they shall be My people.
“They will not teach again, each man his neighbor and each man his brother, saying, ‘Know the LORD,’ for they will all know Me, from the least of them to the greatest of them,” declares the LORD, “for I will forgive their iniquity, and their sin I will remember no more.”
and
Isaiah 11...
Then a shoot will spring from the stem of Jesse,
And a branch from his roots will bear fruit.
The Spirit of the LORD will rest on Him,
The spirit of wisdom and understanding,
The spirit of counsel and strength,
The spirit of knowledge and the fear of the LORD.
And He will delight in the fear of the LORD,
And He will not judge by what His eyes see,
Nor make a decision by what His ears hear;
But with righteousness He will judge the poor,
And decide with fairness for the afflicted of the earth"
It is important to note in Isaiah 11, seven spirits are associated with the anointing of Jesus which believers receive when they are born again.
This also links to the Seven Spirits of God mentioned four times in the book of Revelation.
Folks worried about if their salvation is secure need to prayerfully consider these promises.
Blessings,
Carl Emerson.