2 Timothy 3:
16. All scripture is given by the inspiration of GOD, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
17. That the man of GOD may be perfect, thoroughly furnished unto all good works.
First, every true born again man of GOD are disciple by all scripture = Holy Bible.
Second, one who apparently profited, doctrine, reproof, correction and instruction in righteousness.
Third, henceforth he may be perfect, thoroughly furnished, and in faith able to perform all good works.
These go hand in hand according to the commission Jesus gave to His chosen Apostles before ascension. After He have disciple them since the beginning, and witnessing with works in full time ministry for the Kingdom of GOD. He apparently instructed them to go forth and firstly make likewise disciples of all nation. To what the four Gospels are testaments, and within also inclusion all the sayings of the Old Testament man of GOD relatively to sum up.
Next, the book of Acts is partly a testament of the Apostles' and churches' by discipleship, in faith are with works, even assisted by the Holy Ghost. Furthermore, their epistles to the book of Revelation, is a testament for further discipleship of the churches. That is finally for their added faith in witnessing orally and with works, towards one another and to the lost. Resulting henceforth until today, we now have the Holy Bible in full testament of our forefathers' faith with works.
On the other hand, disciple by all scripture, especially the New Testament put forth in faith alone, and without works, is 'alone' and 'dead'. Likewise, 'hearers' and 'not doers' of the word/teaching/saying of Jesus Christ, even ones through the Apostles, in the New Testament. These are liken unto a 'foolish man', who built his house in the sand, and in due time is tested, but fell with a great fall.
Finally, those who 'abide not' similarly to the word/teaching/saying of Jesus Christ, even ones through the Apostles in the New Testament. These are truly not His disciples, and they will not know the truth, and the truth shall not set them free. They remain slaves to sin, for the Son have not set them free and they're not free indeed.
2 John 1:
9. Whosoever transgresseth, and abide not in the doctrine of Christ, hath not GOD. He that abideth in the doctrine of Christ, he hath both the FATHER and the Son.
10. If there come any unto you, and bring not this doctrine, receive him not into your house, neither bid him GOD speed:
11. For he that biddeth him GOD speed is partaker of his evil deeds.
Matthew 7:
21. Not every one that saith unto Me, Lord, Lord, shall enter into the Kingdom of Heaven; but he that doeth the will of the My FATHER which is in Heaven.
22. Many will say to Me in that day, Lord, Lord, have we not prophesied in Thy name? and in Thy name have cast out devils? and in Thy name done many wonderful works?
23. And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
Apparently we pick and choose and paste scripture by verses and chapters, to justify our true born again Christian faith and works. Nevertheless to the context, truthfully Christ's word/saying/teaching exposes our 'shortsighted', 'lukewarm', and 'still in sin', lack faith with works lives. For now ahead of time, He's helping us to repent and do right, or we'll be only accumulating troubles for ourselves on judgement day.
Hebrews 3:
15. While it is said, To day if ye will hear HIS voice, harden not your hearts, as in the provocation.
Hebrews 4:
1. Let us therefore fear, lest, a promise being left us of entering into HIS rest, any of you should seen to come short of it.
9. There remaineth therefore a rest to the people of GOD.
11. Let us labour therefore to enter into that rest, lest any man fall after the same example of unbelief.
12. For the word of GOD is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.
13. Neither is there any creature that is not manifest in HIS sight: but all things are naked and opened unto the eyes of HIM with whom we have to do.
14. Seeing then that we have a Great High Priest, that is passed into the Heavens, Jesus Son of GOD, let us hold fast our profession.
15. For we have not an High Priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as we are, yet without sin.
16. Let us therefore come boldly unto the Throne of Grace, that we may obtain mercy, and find grace to help in time of need.
Shalom in the name of Jesus Christ.