Well the Bible says it, how, I think by becoming more holy in your walk, reaching perfection. Ye have not yet resisted unto blood, striving against sin. Jesus did that.
Even Jesus wasn't perfect. He was perfected through suffering. Paul hadn't attained perfection yet. Perfect is what we are in the end when He is all in all and we see Him as He is and there's total unity.
In bringing many sons and daughters to glory, it was fitting that God, for whom and through whom everything exists, should make the pioneer of their salvation
perfect through what he suffered.
Heb 2:10
This is a perfect example of the problem with the word perfect.
For Christ to become the perfect sacrifice he had to suffer. Without suffering, paying the price for the effect of sin, the sacrifice would not have become eternal, once for all time.
Now Jesus was sinless, walking in communion with the Father. So Jesus was perfect as far as righteousness was concerned, but not perfect as far as the sacrifice was concerned until he suffered.
Now using this problem in language you can make a phrase appear wrong when it is 100% correct. So I wonder at the motives of someone who continually attempts this. But then maybe these concepts are beyond their understanding.
It strikes me in our walk, as it is a walk, there is always the potential for failure and success each step of the way, so certain language does not work. I cannot say how I will walk tomorrow, only what is before me today, and here I can praise the Lord and uplift His name, knowing I am pure and Holy in his sight. Now that should be enough for all of us, because that is all the Lord is saying we should expect.
It is the unbelievers, spiritists, psychics who are interested in what will happen tomorrow good or bad, while we trust the Lord who we follow and know He has a place in His heart for us and we are in the Kingdom, and He has promised to bring us to glory on the day of judgement. That is good enough for me.