You yourselves are our letter, written on our hearts, known and read by everyone.
NMVYou2f are our Epistle (important or formal letter) written in our hearts, known and read of all men:
TCENTYou are our letter, written on our hearts, known and read by all.
T4TYou yourselves are [MET] like a letter that recommends my work for God to everyone. People see how Christ changed your lives when you believed the message that I taught you. Everyone who knows you can see the result of my work for God.