2 Corinthians 11:5

Yet I consider myself in no way inferior to the [so-called] super-apostles.

2 Corinthians 12:11-12

Now I have become foolish; you have forced me [by questioning my apostleship]. Actually I should have been commended by you [instead of being treated disdainfully], for I was not inferior to those super-apostles, even if I am nobody.

1 Corinthians 15:10

But by the [remarkable] grace of God I am what I am, and His grace toward me was not without effect. In fact, I worked harder than all of the apostles, though it was not I, but the grace of God [His unmerited favor and blessing which was] with me.

Galatians 2:6-9

But from those who were of high reputation (whatever they were—in terms of individual importance—makes no difference to me; God shows no partiality—He is not impressed with the positions that people hold nor does He recognize distinctions such as fame or power)—well, those who were of reputation contributed nothing to me [that is, they had nothing to add to my gospel message nor did they impose any new requirements on me].

Treasury of Scripture Knowledge

Summary

For I suppose I was not a whit behind the very chiefest apostles.

General references

Bible References

I was not

2 Corinthians 12:11
Now I have become foolish; you have forced me [by questioning my apostleship]. Actually I should have been commended by you [instead of being treated disdainfully], for I was not inferior to those super-apostles, even if I am nobody.
1 Corinthians 15:10
But by the [remarkable] grace of God I am what I am, and His grace toward me was not without effect. In fact, I worked harder than all of the apostles, though it was not I, but the grace of God [His unmerited favor and blessing which was] with me.
Galatians 2:6
But from those who were of high reputation (whatever they were—in terms of individual importance—makes no difference to me; God shows no partiality—He is not impressed with the positions that people hold nor does He recognize distinctions such as fame or power)—well, those who were of reputation contributed nothing to me [that is, they had nothing to add to my gospel message nor did they impose any new requirements on me].

General references

Job 13:2

“What you know I also know;
I am not inferior to you.