Paul was not generally given to boasting.  But in order to make a point to the Corinthians that they needed to observe the lifestyle of the teachers they were trusting, he gives a long list in 2 Corinthians 11.23-33 of ways that he has been a better servant than others.

And just before that, he asks for comparisons on other characteristics:

Are they Hebrews?  So am I.

Are they Israelites?  So am I.

Are they offspring of Abraham?  So am I.

Are they servants of Christ?  I am a better one.

This last comparison launches the long list cited above.