Ephesians 5 demonstrates our perfection, and it is spiritual perfection.
25 Husbands, love your wives, just as Christ also loved the church and gave Himself for her,
26 that He might sanctify and cleanse her with the washing of water by the word,
27 that He might present her to Himself a glorious church, not having spot or wrinkle or any such thing, but that she should be holy and without blemish.
There is the old man of the flesh, which can not be perfected, but there is the NEW man of the SPIRIT which is perfected spiritually, and the 2 dont mix.
That is why Jesus tells us you shall be perfect , there is no way you can strive for perfection in your spirit, it is a characteristic of the new creation in Christ that is perfect before God, without spot or blemish, otherwise it could not have an eternal life with God indwelling your spirit. His church will be without spot or blemish, spiritually, in the Spirit.
Matthew 5:48
Therefore you shall be perfect, just as your Father in heaven is perfect.
BUT we are judged for the deeds done in the body (the flesh). We are not judged negatively for deeds done according to the Spirit's will for us if we are spiritually united as one spirit with HIM, that relationship is perfect in every possible way. For example God has prepared beforehand good works for us to do, and those works then are truly good works against which there is no judgement of condemnation.
Ephesians 2:10 For we are His workmanship, created in Christ Jesus for good works, which God prepared beforehand that we should walk in them.
2 Corinthians 5:10 For we must all appear before the judgment seat of Christ, that each one may receive the things
done in the body, according to what he has done, whether good or bad.
God knows how to divide soul from spirit.
Hebrews 12
22 But you have come to Mount Zion and to the city of the living God, the heavenly Jerusalem, to an innumerable company of angels,
23 to the general assembly and church of the firstborn
who are registered in heaven, to God the Judge of all,
to the spirits of just men made perfect,
24 to Jesus the Mediator of the new covenant, and to the blood of sprinkling that speaks better things than
that of Abel.
There is then such a thing as sinless perfection, but it only exists in the Spirit with His Holy Spirit joined together with us as one spirit in Him. That is the perfection of the relationship and eternal life.
Paul also describes the difference between joined in the flesh versus joined in the spirit, in both joining's they become as all of ONE.
1 Corinthians 6:16-18
New King James Version
16 Or do you not know that he who is joined to a harlot is one body
with her? For “the two,” He says, “shall become one flesh.”
17 But he who is joined to the Lord is one spirit
with Him.
18 Flee sexual immorality. Every sin that a man does is outside the body, but he who commits sexual immorality sins against his own body.
John 10:16
And other sheep I have which are not of this fold; them also I must bring, and they will hear My voice; and there will be one flock
and one shepherd.
ONLY the spirit of a man is saved, the body is not. We get a new spirit when born of God, but the body is dead because of sin. We get a new glorious body at the resurrection. When you die, only your NEW spirit in Christ goes to be with the LORD. We have then a spiritual body and a physical body, read 1 Corinthians 15..
42 So also is the resurrection of the dead. It is sown in corruption; it is raised in incorruption: 43 It is sown in dishonour; it is raised in glory: it is sown in weakness; it is raised in power: 44 It is sown a natural body; it is raised a spiritual body. There is a natural body, and there is a spiritual body.