2 Corinthians 11:5

For I reckon that I am in no respect behind the most eminent apostles.

2 Corinthians 12:11-12

I have become foolish; ye compelled me; for I ought to be commended by you; for in nothing was I inferior to the most eminent apostles, even if I am nothing.

1 Corinthians 15:10

But by God's grace I am what I am; and His grace which was bestowed upon me did not prove vain; but I labored more abundantly than they all; yet not I, but the grace of God which was with me.

Galatians 2:6-9

But from those reputed to be something (whatever they were, it matters not to me: God does not accept man's person): to me, in fact, those of repute added nothing;

Treasury of Scripture Knowledge

Summary

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

Bible References

I was not

2 Corinthians 12:11
I have become foolish; ye compelled me; for I ought to be commended by you; for in nothing was I inferior to the most eminent apostles, even if I am nothing.
1 Corinthians 15:10
But by God's grace I am what I am; and His grace which was bestowed upon me did not prove vain; but I labored more abundantly than they all; yet not I, but the grace of God which was with me.
Galatians 2:6
But from those reputed to be something (whatever they were, it matters not to me: God does not accept man's person): to me, in fact, those of repute added nothing;