(1Co 9:18) “What is my reward then? Verily that, when I preach the gospel, I may make the gospel of Christ without charge, that I abuse not my power in the gospel. (19) For though I be free from all men, yet have I made myself servant unto all, that I might gain the more.” The reward was a wisdom allowing Paul to see within his own heart. A pride was there he was afraid to feed (abuse). So, he made himself a servant to all to aid his fight against pride, seeking humility. The result was spiritual in every way, that for self and souls for the Lord’s glory.