2 Corinthians 6:3 Giving no offence in any thing, that the ministry be not blamed:

The Apostle Paul puts his ministry under scrutiny explaining that he was careful so as not put a stumbling block (meaning of the word “offence) to his hearers by the inconsistency of his own life with the message that he preaches. Indeed, the Word of God brings conviction to the heart of the preacher so that by him, it can thus reach the hearts and minds of his hearers. He sets the example.

Here from verses 3-10, he will share the sufferings that came upon him in the work of the gospel on behalf of Christ. The reason is that he wants to safeguard the ministry of the gospel that he has received from the Lord.ยน [Hendricksen]