Are you serious with that question!? What in the world do you think the glorification of the saints, which will be the third and final stage of our redemption, means if not our moral-spiritual perfection? Don't you know that no sinner can dwell with God?
Ps 15
15:1 A psalm of David.
LORD, who may dwell in your sanctuary?
Who may live on your holy hill?
2 He whose walk is blameless
and who does what is righteous,
who speaks the truth from his heart
3 and has no slander on his tongue,
who does his neighbor no wrong
and casts no slur on his fellowman,
4 who despises a vile man
but honors those who fear the LORD,
who keeps his oath
even when it hurts,
5 who lends his money without usury
NIV
Don't you know that ONLY the RIGHTEOUS will inherit the kingdom of God? Nothing impure will enter heaven, let alone dwell in the presence of God in his sanctuary (Rev 21:27; 22:15). The white robes the saints will be given will represent our perfect, pure, spotless, sinless state (Rev 6:11), just as Jesus' white robe represents his. But all sinners will be forever banished (Rev 21:8, 27).
And in the New Eternal Order, all the saints' minds and memories will be renewed, which doesn't mean the saints won't recall anything from the Old Order, there is a clear sense that seems to teach they won't remember anything they did that didn't bring glory to God, or won't remember anything that they should have done that would have brought glory to Him, or won't remember any loved ones who rejected Christ in their lives.
Rev 21:4
4 He will wipe every tear from their eyes. There will be no more death or mourning or crying or pain, for the old order of things has passed away."
NIV
If the saints had memories of the kinds of things I stated in my last paragraph, then there would certainly be plenty of mourning, crying and pain, which would render their existence in the New Order far from perfect!
What is the point to the New Creation (New Order) if sin is not abolished forever? Then what is really new: "accidental" sin? There's plenty of that on earth among the saints, already! David even prayed to God to reveal his hidden sins -- sins he wasn't aware of (Ps 19:12)! So...the New Order will be same ol', same ol'? And if secret sins will exist in it, why not willful transgressions?
The scripture tells us that the redemption of the body, when the mortal puts on immortality and we have a body like his glorious body is glorification:the final stage of redemption, the glorification of the saints. It does not say moral spiritual perfection is what glorification means.
Php. 3: 20For our conversation is in heaven; from whence also we look for the Saviour, the Lord Jesus Christ:
21Who shall change our vile body, that it may be fashioned like unto his glorious body, according to the working whereby he is able even to subdue all things unto himself.
1 Cor. 15;:35¶But some man will say, How are the dead raised up? and with what body do they come?
36Thou fool, that which thou sowest is not quickened, except it die:
37And that which thou sowest, thou sowest not that body that shall be, but bare grain, it may chance of wheat, or of some other grain:
38But God giveth it a body as it hath pleased him, and to every seed his own body.
39¶All flesh is not the same flesh: but there is one kind of flesh of men, another flesh of beasts, another of fishes, and another of birds.
40¶There are also celestial bodies, and bodies terrestrial: but the
glory of the celestial is one, and the
glory of the terrestrial is another.
41There is one
glory of the sun, and another
glory of the moon, and another
glory of the stars: for one star differeth from another star in
glory.
42¶So also is the resurrection of the dead. It is sown in corruption; it is raised in incorruption:
43It is sown in dishonour; it is raised in
glory: it is sown in weakness; it is raised in power:
44It is sown a natural
body; it is raised a spiritual
body. There is a natural
body, and there is a spiritual
body.
45And so it is written, The first man Adam was made a living soul; the last Adam was made a quickening spirit.
46¶Howbeit that was not first which is spiritual, but that which is natural; and afterward that which is spiritual.
47The first man is of the earth, earthy: the second man is the Lord from heaven.
48
As is the earthy, such are they also that are earthy: and as is the heavenly, such are they also that are heavenly.
49And as we have borne the image of the earthy, we shall also bear the image of the heavenly.
1¶For we know that if our earthly house of this tabernacle were dissolved, we have a building of God, an house not made with hands, eternal in the heavens.
2For in this we groan, earnestly desiring to be clothed upon with our house which is from heaven:
3If so be that being clothed we shall not be found naked.
4For we that are in this tabernacle do groan, being burdened: not for that we would be unclothed, but clothed upon, that mortality might be swallowed up of life.
5Now he that hath wrought us for the selfsame thing is God, who also hath given unto us the earnest of the Spirit.
4When Christ, who is our life, shall appear [in glorified flesh], then shall ye also appear [in glorified flesh]with him in glory.
5¶Mortify therefore your members which are upon the earth; fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry:
6For which things' sake the wrath of God cometh on the children of disobedience:
7In the which ye also walked some time, when ye lived in them.
8¶But now ye also put off all these; anger, wrath, malice, blasphemy, filthy communication out of your mouth.
9Lie not one to another, seeing that ye have put off the old man with his deeds;
10And have put on the new man, which is renewed in knowledge after the image of him that created him:
11Where there is neither Greek nor Jew, circumcision nor uncircumcision, Barbarian, Scythian, bond nor free: but Christ is all, and in all.
12¶Put on therefore, as the elect of God, holy and beloved, bowels of mercies, kindness, humbleness of mind, meekness, longsuffering;
13Forbearing one another, and forgiving one another, if any man have a quarrel against any: even as Christ forgave you, so also do ye.
14And above all these things put on charity, which is the bond of perfectness.
In this vile body, we put on our soul the spiritual characteristics of Christ by faith and submitted wills. That process does not need to change into some imposed inability to sin in heaven. We can do it willingly now more and more as we are being transformed by the renewing of our minds. It will be so much easier to do willingly when we no longer know in part and our mind is exposed directly to the spiritual realities we feel after now with faith, and we see those truths clearly.