Even if I caused you sorrow by my letter, I do not regret it. Though I did regret it – I see that my letter hurt you, but only for a little while –
NIV
For even though I did grieve you with my letter, I do not regret [it now], though I did regret it; for I see that that letter did pain you, though only for a little while
AMP
For though I made you sorry with a letter, I do not repent, though I did repent: for I perceive that the same epistle hath made you sorry, though it were but for a season.
KJV
I, Paul, write this greeting in my own hand, which is the distinguishing mark in all my letters. This is how I write.
NIV
I, Paul, write you this final greeting with my own hand. This is the mark and sign [that it is not a forgery] in every letter of mine. It is the way I write [my handwriting and signature].
AMP
The salutation of Paul with mine own hand, which is the token in every epistle: so I write.
KJV
Take special note of those who do not obey our instruction in this letter. Do not associate with them, in order that they may feel ashamed.
NIV
But if anyone [in the church] refuses to obey what we say in this letter, take note of that person and do not associate with him, so that he may be ashamed.
AMP
And if any man obey not our word by this epistle, note that man, and have no company with him, that he may be ashamed.
KJV
After this letter has been read to you, see that it is also read in the church of the Laodiceans and that you in turn read the letter from Laodicea.
NIV
And when this epistle has been read before you, [see] that it is read also in the assembly (the church) of the Laodiceans, and also [see] that you yourselves in turn read the [letter that comes to you] from Laodicea.
AMP
And when this epistle is read among you, cause that it be read also in the church of the Laodiceans; and that ye likewise read the epistle from Laodicea.
KJV
You yourselves are our letter, written on our hearts, known and read by everyone.
NIV
[No] you yourselves are our letter of recommendation (our credentials), written in your hearts, to be known (perceived, recognized) and read by everybody.
AMP
Ye are our epistle written in our hearts, known and read of all men:
KJV