I believe, based on verses like 2 Timothy 3:16, that perfection is possible for the believer, since it says the man of God can be perfect, I kind of have to go with that.
However, I have no idea how that would be done! I know lots of other verses in the Bible too, like the flesh lusts against the Spirit so you cannot do those things you would like to. Romans 7 emphasizes this point as well. I know that we are not supposed to sin, but if we do, we have an Advocate with the Father. Plus many other verses.
The bottom line is this: Perfection is our goal. Be perfect as your Father in heaven is perfect. We are to desire to be conformed to the image of Christ, the One who is Perfect.
Perfection in this life is tough since we are in an imperfect world, surrounded by a sinful system that we partake in daily without even realizing we are sinning. This is the perfection John Wesley attempted to explain, we can be perfect from willful sin, but not from unknown sin, etc. (If I”m understanding him rightly anyway!).
I am not perfect and am constantly reminded of this fact. I have met some who think they are perfect, yet I’ve spent enough time around them to doubt this highly.
The second you are aware of your perfection is the second pride would enter. It is my contention that if a person did achieve perfection, he would be the last to know it and would certainly not be going around bragging about his perfection.
The tendency today, however, is not to pretend to be perfect, but to act as if perfection isn’t even a remote concern, to, in fact, revel in sin and pretend Jesus is cool with this. The Bible speaks of perfection way to often for us to ignore it or chalk it up to heresy or loophole your way out of it.
Our salvation is based on faith in Christ’s death and resurrection, the blood He shed for the forgiveness of sins and the resurrection He went through to raise us up to new life. Perfection does not save; perfection is the goal of being in Christ. Christ is first and without Him we are lost. With Him we become like Him. That’s our goal.