1 Corinthians 15:11

Whether then it be I or they, so we preach, and so ye believed. [Paul recognizes the tardiness of his belief on the Lord and the lateness of his vision of him as an evidence of his unworthiness. Though this personal allusion appears on its face to be a digression from his argument, it really lends great force to it. There could be no higher honor known to men than to be chosen as a witness of the resurrection of Christ. For this reason it might be thought that Paul was zealous in establishing the truth of the resurrection because of the honors which he enjoyed as a witness to that truth. But he reminds them that the circumstances under which he saw the Lord so emphasized his own unworthiness (he being then on his way to persecute the Christians at Damascus) that the memory of the event wakened in him a sense of humiliation rather than exaltation. In fact, he would be exalted rather than dishonored by their unbelief, for he could claim no reverence as a witness when his testimony necessarily involved a confession of his crimes. But having confessed his crime and consequent inferiority, and knowing that this admission would be most strictly construed by those who disparaged him and contended that he was not an apostle, he rehabilitates himself by showing that his own littleness had been made big by the abounding grace of God, so that he had labored more abundantly than any of the apostles. Moreover, those to whom Peter or Apollos were more acceptable, would gain nothing by their partiality and discrimination in respect to this matter, for all who had preached Christ to them had been a unit in proclaiming the resurrection. Christ had never been preached otherwise than as a risen one. Again, this preaching had resulted in their believing, which was the point he did not wish them to lose sight of. Having committed themselves to belief, they did wrong in thus becoming champions of unbelief; i. e., unbelief in the resurrection. It should be observed that in proving the resurrection Paul cites witnesses (1) who were living; (2) who were many of them commonly known by name; (3) who were too familiar with the form, face, voice, manner, life, etc., of Jesus to be deceived by a pretender, if any could have found motive for practicing such a deception. Having shown their folly in abandoning without evidence that which they had believed on competent testimony, the apostle turns to show the consequences of their act.]