John Trapp on Job 32:15

Verſe 15. They were amazed] As if they had ſeen Meduſa's head, or ſome ſuch terrible ſpectacle that had rendred them dumb. Talkative enough they have been, when there was no ſuch neceſſity; but now that they might ſpeak to ſome purpoſe, they ſtand like ſtocks, and are mute as fiſhes, whereby they bewray their ignorance and folly. Silence in ſome caſes is ſepes ſapientiae, as the Rabbins ſpeak,Pirke aboth. the fruit and fence of wiſdome, Amos 5.13. See the Note there. But withal there is a ſinful ſilence, which Luther wiſhed never to be found guilty of.Modò impii ſilentii non arguar. Luth. And it is the divel doubtleſſe that gaggeth people, when being called to ſpeak of, or for God, as theſe friends of Job were at this time, they anſwer no more,

They leave ſpeaking.] The deſert a good Cauſe, or betray it by a cowardly ſilence. It may be feared the ſpirit of faith is no indweller, where the door of the lips move not right, 2 Cor. 4.13. He ſpeaks thus of thoſe three ſeniors in a third perſon, by way of irony and contempt, turning his talk to the by-ſtanders, whereof its likely, there were many: or (as Tremellius thinketh) to Job, with whom he ſeeketh to ingratiate.