Well. The Greek word used there, entos, literally means
[*=left]within, inside
[*=left]within you i.e. in the midst of you
[*=left]within you i.e. your soul
Soooooo 
the KJV says it and so do other good translations.
The whole teaching. Why teach the body started with Paul. Perhaps I'm missing something so far but He calls every tribe tongue nation and since Adam and Eve a Savior has been expected. Can you please summarize why this teaching exists and what it claims to teach us about our Lord? I saw something about the body and the bride being different. A quick explanation of that would be helpful at understanding the intent here too.
Well it's multi-faceted and there is no quick explanation. I guess I could bullet point it?
Because Christ tells you to follow Paul. Rejecting Paul (you may say you don't reject him. But according to the revelation of the mystery (Rom 16.25) you are rejecting Paul). Paul says his message is NEW, different, important, unique. And is not what was preached since the world began as Peter and the 11 preached
(Acts 3.21 compared to Rom 16.25). Paul says what he preaches was kept SECRET since the world began.
“Verily, verily, I say unto you, He that receiveth whomsoever I send receiveth me; and he that receiveth me receiveth him that sent me.” – John 13:20
Gal 1.11-12
But I certify you, brethren, that the gospel which was preached of me (Paul) is not after man. For I neither received it of man, neither was I taught it,
but by the revelation of Jesus Christ.
1 Cor 1.17
For
Christ sent me (Paul) not to baptize, but to preach the gospel: not with wisdom of words, lest the cross of Christ should be
made of none effect.
One, salvation comes out of the gospel revealed to Paul. Not the kingdom gospel in Matthew-Acts nor Heb-Rev.
Two, your eternal reward is based on your understanding of Paul. Hence, your works have nothing to do with it.
1 Cor 14.37
If any man think himself to be a prophet, or spiritual,
let him acknowledge that the things that I (Paul) write unto you are the commandments of the Lord.
But if any man be ignorant, let him be ignorant.
Paul's mystery is the foundation from which you are to build upon.
Building on ANY OTHER FOUNDATION will result in LOSS OF REWARD! All those who don't heed to Paul's warnings will only have their salvation, because the down payment of the holy Spirit in them is the only thing that stands the test of fire at the judgement seat of Christ.
According to the grace of God which is given unto
me (Paul), as a wise masterbuilder,
I (Paul) have laid the foundation, and another buildeth thereon. But let every man
take heed how he buildeth thereupon. For other foundation can no man lay than that is laid, which is Jesus Christ. Now if any man build upon this foundation gold, silver, precious stones, wood, hay, stubble; Every man’s work shall be made manifest: for the day shall declare it, because it shall be revealed by fire; and the fire shall try every man’s work of what sort it is. If any man’s work abide which he hath built thereupon, he shall receive a reward. If any man’s work shall be burned, he shall suffer loss: but he himself shall be saved; yet so as by fire.
How does God through Paul define work? 2 Tim 2.15
Study to shew thyself approved unto God, a
workman that needeth not to be ashamed,
rightly dividing the word of truth.
Someone who studies and rightly divided's. You asked why is right division important. As I am showing you, it's extremely important.
What happens when you build on the
wrong foundation? Rom 15.20
Yea, so have
I (Paul) strived to preach the gospel,
not where Christ was named, lest
I should build upon another man’s foundation:
Paul says take heed to how you build on the foundation of Christ that he laid.
Not to build on the foundation laid where Christ was named! Where was Christ named? Matt-John.
Why do preachers keep their members in the books of Matthew-John and rarely leave them? 2 Cor 4.4
But if
our gospel (Paul's gospel) be hid, it is hid to them that are lost: In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them.
2 Cor 11.13
For such are false apostles, deceitful workers, transforming themselves into the apostles of Christ. And no marvel; for Satan himself is transformed into an angel of light. Therefore it is no great thing if his ministers also be transformed as the
ministers of righteousness; whose end shall be according to their
works.
How many Christians today think their works are proof of salvation and think it's required to get into heaven. This is opposite and contrary to Paul's gospel.
Not by
works of righteousness which
we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost; Which he shed on us abundantly through Jesus Christ our Saviour; That being justified by his grace, we
should be made heirs according to the hope of eternal life.
The Spirit itself beareth witness with our spirit, that we are the children of God: And if children,
then heirs; heirs of God,
and joint-heirs with Christ;
if so be that we suffer with him, that we may be also glorified together.
Three, you will not be qualified to reign with Christ in eternity. (Although, this is still a topic of debate among Mid Act's Pauline dispensationalist. I can see it either way. But, never the less, it's still a very serious possibility.)
Four, your spiritual life in this life will never grow; making you ill equipped for the
Principalities, Powers, Mights, Thrones, and Dominion seats in heaven. You will stay a spiritual babe in Christ and never come unto the knowledge of the truth which equips you for ruling and reigning with Christ in heaven. There will be no other time in eternity where you can gain what Christ want's to form in you but in this life right now. And only can Paul's doctrine build that in you. Understanding the full breath of the mystery is extremely important. Most, over the past 2000 years, have rejected these truths, but they have always been around. You can even read about it in history. I have a video on it if your interested.
Read all of 2 Tim 3 in light of everything I said to you here. If you took anything at all from what I said, 2 Tim 3 should be an eye opener for you. Also note, that the time period in which Paul is talking about in that chapter is referring to saved people IN CHRIST! Christians!
"Ever learning, and never able to come to the knowledge of the truth. Now as Jannes and Jambres withstood Moses, so do these also
resist the truth: men of corrupt minds, reprobate concerning the faith. But they shall proceed no further: for their folly shall be manifest unto all men, as theirs also was.
But thou hast fully known my (Paul's) doctrine, manner of life, purpose, faith, longsuffering, charity, patience..."
Resisting the mystery of Christ revealed to Paul is called
"men of corrupted minds, reprobate to the faith" I hear Christians today say DOCTRINE doesn't matter and it's all about loving yourself and being a good person. And "I Follow Jesus." Yet,
Christ tell's them to follow PAUL!
1 Cor 11.1
Be ye followers of
me (Paul),
even as I also am of Christ.
Phil 3.17
Brethren, be followers together of
me (Paul), and
mark them which walk so as ye have us for an
ensample.
1 Cor 4.16
Wherefore I beseech you, be ye followers of
me (Paul).
“Verily, verily, I say unto you, He that receiveth whomsoever I send receiveth me; and he that receiveth me receiveth him that sent me.” – John 13:20
