ISB ~ 2 Corinthians 12 v12

signs of a true apostle:Visible manifestations of divine power. Paul does not specify the exact nature of these extraordinary deeds but appeals to them as confirmation of his apostleship (cf. Mk 16:20; Rom 15:18-19; Heb 2:4). If Paul were a fraud, as his critics claim, such miracles would not have accompanied his message.