Some people have whack-job ideas of "Christian perfection". I'm all for John Wesley, John Owen, William Law, Dietrich Bonhoeffer, so long as you have a foundation in Romans 5, Romans 8, all of Ephesians, all of Galatians, all of I John....um, actually, all of the New Testament. Get your foundation of the gospel of grace well-laid, and then the writings of the dead guys won't mess with your mind.
I wholeheartedly agree with the writer of Hebrews 6, "Let us grow up into maturity, and get beyond just merely having our doctrine straight." (Note: maturity, or "perfection", comes after foundational doctrines are laid.) In Hebrews 6, the writer pleads, "People, let's get on with it."
"Leaving the doctrines of Christ" does not mean leaving them behind. Rather, it means getting on with the program, and building the beautiful edifice. It means putting something on that Christ-foundation. Putting something on that foundation means you and I, being built together as living stones, the result of which will be maturity, i.e. "perfection".
Burning question: what is Christian maturity?
Short answer: right relationships.
Long answer: the law never brought anyone or anything to maturity. Hebrews 7:19. But the New Covenant ("the bringing of a better hope") did. What sort of lifestyle is becoming a New Covenant son or daughter of God?
"Above all these things, put on charity, which is the bond of perfectness." Col. 3:14
"Whoever says 'I know Him', but keeps not His commandments, is a liar and the truth is not in him. Whoever keeps His word, in him truly is the love of God perfected, and by this we know we are in Him." I John 2: 4,5
Next, I John 3: 23 unlocks all of I John, and once-and-for-all clarifies this thing called Christian perfection:
"This is his commandment: That we should believe on the name of his Son Jesus Christ, and love one another, as he gave us commandment. The man who keeps these commandments, dwells in Him, and He in him..."
Love. Right relationships. This is the essence of "perfection". In other words, it separates the men from the boys.