A.T. Robertson Commentary Mark 15:5

"But Jesus no more answered anything; insomuch that Pilate marvelled." — Mark 15:5 (ASV)

Marvelled (θαυμαζειν). Pilate was sure of the innocence of Jesus and saw through their envy , but he was hoping that Jesus would answer these charges to relieve him of the burden. He marvelled also at the self-control of Jesus.