Matt. 10:22, “All men will hate you because of me, but he who stands firm to the end will be saved.” [Back-sliding is the opposite of standing firm or persevering, cf. Jer. 2:19, 3:22, 5:6, 14:7, 15:6 and Ezek. 37:23.]
Rom. 11:22, “Consider therefore the kindness and sternness of God: sternness to those who fell, but kindness to you, provided that you continue in his kindness. Otherwise, you also will be cut off.”
1Cor. 15:2, “By this gospel you are saved, if you hold firmly to the word I preached to you. Otherwise, you have believed in vain.”
Gal. 5:4, “You who are trying to be justified by law have been alienated from Christ; you have fallen away from grace.”
Col. 1:22-23, “But now he has reconciled you by Christ’s physical body through death to present you holy in his sight, without blemish and free from accusation—if you continue in your faith, established and firm, not moved from the hope held out in the gospel.”
2Thes. 1:4-5, “Therefore, among God’s churches we boast about your perseverance and faith in all the persecutions and trials you are enduring. All this is evidence that God’s judgment is right, and as a result you will be counted worthy of the kingdom of God, for which you are suffering.”
2Tim. 2:12, “If we endure, we will also reign with him. If we disown him, he will also disown us;”
Heb. 3:6&14, “But Christ is faithful as a son over God’s house. And we are his house, if we hold on to our courage and the hope of which we boast… We have come to share in Christ if we hold firmly till the end the confidence we had at first.”
Heb. 6:4-6, “It is impossible for those who have once been enlightened, who have tasted the heavenly gift, who have shared in the Holy Spirit, who have tasted the goodness of the word of God and the powers of the coming age, if they fall away, to be brought back to repentance, because to their loss they are crucifying the Son of God all over again and subjecting him to public disgrace.” This passage indicates that apostasy may be viewed as total depravity or blasphemy against the HS (MT 12:31).
Heb. 10:26-36, “If we deliberately keep on sinning after we have received the knowledge of the truth, no sacrifice for sins is left, but only a fearful expectation of judgment and of raging fire that will consume the enemies of God… So do not throw away your confidence; it will be richly rewarded. You need to persevere so that when you have done the will of God, you will receive what he has promised.”
Jam. 1:12, “Blessed is the man who perseveres under trial, because when he has stood the test, he will receive the crown of life that God has promised to those who love him.”
2Pet. 1:10-11, “Therefore, my brothers, be all the more eager to make your calling and election sure. For if you do these things, you will never fall, and you will receive a rich welcome into the eternal kingdom of our Lord and Savior Jesus Christ.”
2Pet. 2:20, “If they have escaped the corruption of the world by knowing our Lord and Savior Jesus Christ and are again entangled in it and overcome, they are worse off at the end than they were at the beginning.”
ou - The command to repent & believe is the condition for entering life, repent meaning a turn from unbelief to belief.
Me - Yes, turning from disbelief and not returning to unbelief. IOW, perseverance is needed.
JOHN
Jn 3:36 (A) 36 He that believeth on the Son hath everlasting life:
(MY NOTE: Anyone that places their FAITH in the Son HAS ALREADY/RIGHT NOW eternal life)
Jn 5:24 Verily, verily, I say unto you, He that heareth my word, and believeth on him that sent me, hath everlasting life, and shall not come into condemnation; but is passed from death unto life.
(MY NOTE: He that has FAITH in Christ & believes the Father sent Him "HAS" < present tense > ETERNAL LIFE.)
Jn 6:47 Verily, verily, I say unto you, He that believeth on me hath everlasting life.
(MY NOTE: Whoever has FAITH in Christ: HAS eternal life)
Jn 14:
16 And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever;
MY NOTE: Believers in the Son will be "given" the Holy Spirit. Who will ABIBE with you FOREVER)
17 Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you.
(MY NOTE: The HOLY Spirit of Truth GIVEN to ALL believers DWELLS & REMAINS in them)
1 Jn 5:13 These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life, and that ye may believe on the name of the Son of God..
(MY NOTE: John writes, those who BELIEVE in the Son of God ALREADY HAVE eternal life)
LUKE & PETER:
Acts 10:44 While Peter yet spake these words, the Holy Ghost fell on all them which heard the word.
(MY NOTE: The Holy Spirit falls on these gentiles, void of any works/strings beyond FAITH)
45 And they of the circumcision which believed were astonished, as many as came with Peter, because that on the Gentiles also was poured out the gift of the Holy Ghost.
(MY NOTE: Thru FAITH ALONE these gentiles received the free gift of God's eternally indwelling, salvation sealing Holy Spirit.)
Acts 11:
16 Then remembered I the word of the Lord, how that he said, John indeed baptized with water; but ye shall be baptized with the Holy Ghost..’
(MY NOTE: Only Christ can baptize with His salvation sealing, eternal life giving Holy Spirit)
17 Forasmuch then as God gave them the like gift as he did unto us, who believed on the Lord Jesus Christ; what was I, that I could withstand God?
(MY NOTE: Gentiles that believed/had FAITH in the Lord Jesus Christ. FREELY received Christ's salvation sealing Holy Spirit baptism/GIFT/Acts 10:45, 11:17!)
Acts 13:48 And when the Gentiles heard this, they were glad, and glorified the word of the Lord: and as many as were ordained to eternal life believed.
MY NOTE: These gentiles BELIEVED & were ORDAINED to eternal life)
Acts 15:
8 And God, which knoweth the hearts, bare them witness, giving them the Holy Ghost, even as he did unto us;
(MY NOTE: Christ knows every persons true heart & GAVE these gentiles His salvation sealing, eternal life giving Holy Spirit. Next verse by cites by FAITH ALONE!)
9 And put no difference between us and them, purifying their hearts by faith.
(MY NOTE: Thru FAITH ALONE these BELIEVING were PURIFIED/CLEASNED when GIVEN Christ's eternal life giving Holy Spirit, thru FAITH ALOVE)
PAUL:
Rom 5:
5 Therefore being justified by faith, we have peace with God through our Lord Jesus Christ:
(MY NOTE: We = BELIEVERS - Rom 1:7 - Have been <past tense > justified = Judicially declared/pronounced righteous by a sovereign creator Godthru/by FAITH)
Rom 3:26 To declare, I say, at this time his righteousness: that he might be just, and the justifier of him which believeth in Jesus.
(MY NOTE: Jesus the justifier; Judicially declared/pronounced the believer righteous thru FAITH ALONE)
Rom 4:5 But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness.
(MY NOTE: He that believes on Jesus, the justifier. Thru FAITH ALONE is pronounced righteous/placed in a right standing with God the Father).
Eph 2:
8 For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:
(MY NOTE: Salvation is accessed by Grace thru FAITH)
9 Not of works, lest any man should boast.
(MY NOTE: No self-works requirements allowed)
Jude 1:24 Now unto him that is able to keep you from falling, and to present you faultless before the presence of his glory with exceeding joy,
(MY NOTE: It's Christ that's able to keep you, not our self-works)
1 Jn 2:12 I write unto you, little children, because your sins are forgiven you for his name's sake.
(MY NOTE: Believers you ARE forgiven (NOT just until your next sin) for Christ's name's sake, because He paid for ALL the believrs sins)
Heb 9:12 Neither by the blood of goats and calves, but by his own blood he entered in once into the holy place, having obtained eternal redemption for us.
(MY NOTE: Christ via the offering of his own sinless blood, entered once into heaven holy place & obtained ETERNAL REDEMPTION for us.)
Heb 9:15 And for this cause he is the mediator of the new testament, that by means of death, for the redemption of the transgressions that were under the first testament, they which are called might receive the promise of eternal inheritance.
(MY NOTE: Christ sinless payment REDEEMED believers/saints from Mosaic law sin punishment & has obtained scriptures promise of an ETERNAL inheritance)
Heb 13:20 Now the God of peace, that brought again from the dead our Lord Jesus, that great shepherd of the sheep, through the blood of the everlasting covenant,
(NOTE: This new Christ administered order of Melchizedek sin management blood covenant is EVERLASTING!)
Heb 10:14 For by one offering he hath perfected for ever them that are sanctified.
(MY NOTE: Christ PERFECTED FOREVER those that are sanctified)
Ps 37:28 For the Lord loves justice, And does not forsake His saints; They are preserved forever, But the descendants of the wicked shall be cut off.
(MY NOTE: The Lord doesn't forsake His saints/believers, but, PRESERVES them FOREVER!)
If a person is sealed by the Holy Spirit (Eph 1:13–14 & Eph 4:30), born of God (Jn 1:13), made a new creation (2 Cor 5:17), given a new heart (Rom 2:29), indwelt by the Holy Spirit (Rom 8:9) & kept by God's power (1 Pet 1:5), then returning to unbelief is impossible. Unbelief is the condition of the unregenerate, not the regenerate. The warnings you listed expose false faith, they do not describe the loss of true salvation. A sealed believer cannot go back to unbelief any more than a person can ""un‑re born."" Perseverance is the evidence of life, not the condition for keeping it.