1 Corinthians 15:8

and last of all, as to the child untimely born, he appeared to me also. [Acts 9:5; Acts 22:14; Acts 26:16. The abortive child is usually weak, puny and undersized. Paul speaks of himself as such a child in the brotherhood of the apostles, and does this without mock modesty (comp. 2 Corinthians 12:11; Ephesians 3:8). For comment on this catalogue of appearances, see "Fourfold Gospel," pp. 751, 753, 761, 764, 766. The other apostles had three years and a half filled with instruction, and so were fully developed in their office; while Paul became a disciple in an instant, and received his instructions briefly by revelation.]