Cross reference
2 Corinthians 3:2
2 You are our letter, written in our hearts, known and read by all men;
Romans 1:8
8 First, I thank my God through Jesus Christ for all of you, that your faith is proclaimed throughout the whole world.
1 Corinthians 9:1-2
1 Am I not free? Am I not an apostle? Haven't I seen Jesus Christ, our Lord? Aren't you my work in the Lord?
2 If to others I am not an apostle, yet at least I am to you; for you are the seal of my apostleship in the Lord.
1 Thessalonians 1:8
8 For from you has sounded forth the word of the Lord, not only in Macedonia and Achaia, but also in every place your faith toward God has gone forth; so that we need not to say anything.
1 Corinthians 3:10
10 According to the grace of God which was given to me, as a wise master builder I laid a foundation, and another builds on it. But let each man be careful how he builds on it.
2 Corinthians 7:3
3 I say this not to condemn you, for I have said before, that you are in our hearts to die together and live together.
2 Corinthians 11:11
11 Why? Because I don't love you? God knows.
2 Corinthians 12:15
15 I will most gladly spend and be spent for your souls. If I love you more abundantly, am I loved the less?
Philippians 1:7
7 It is even right for me to think this way on behalf of all of you, because I have you in my heart, because, both in my bonds and in the defense and confirmation of the Gospel, you all are partakers with me of grace.