2 Corinthians 11:5
“For I reckon that I am not a whit behind the very chiefest Apostles,” no longer making comparison of himself with them, but with Peter and the rest. 'So that if they know more than I do, [they know more] than they also.' And observe how here also he shows modesty. For he did not say, 'the Apostles said nothing more than I,' but what? “I reckon,” so I deem, “that I am not a whit behind the very chiefest Apostles.” For since this also appeared to bespeak an inferiority in him, that those having preceded him were of greater name; and more respect was entertained for them, and these persons were intending to foist themselves in; therefore he makes this comparison of himself with them with the dignity that becomes him. Therefore he also mentions them with encomiums, not speaking simply of “the Apostles,” but “the very chiefest,” meaning Peter and James and John.
Source: Homilies on Second Corinthians (New Advent)