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
Jesus answered, "I did tell you, but you do not believe. The works I do in my Father's name testify about me,"
NIV
Jesus answered them, I have told you so, yet you do not believe Me [you do not trust Me and rely on Me]. The very works that I do by the power of My Father and in My Father's name bear witness concerning Me [they are My credentials and evidence in support of Me].
AMP
Jesus answered them, I told you, and ye believed not: the works that I do in my Father's name, they bear witness of me.
KJV
Are we beginning to commend ourselves again? Or do we need, like some people, letters of recommendation to you or from you?
NIV
ARE WE starting to commend ourselves again? Or we do not, like some [false teachers], need written credentials or letters of recommendation to you or from you, [do we]?
AMP
Do we begin again to commend ourselves? or need we, as some others, epistles of commendation to you, or letters of commendation from you?
KJV