John Trapp on Job 21:5

Verſe 5. Mark me, and be aſtonied] Heb. Look upon me. He had ſaid before, Hear and hear, now, Behold and ſee if there be any ſorrow like unto my ſorrow. Mark it I ſay, and ſtand amazed at it. Did you ever find any on this ſide hell ſo ſore afflicted as I am? Is it not becauſe you are not duly affected with my miſeries, that ye are ſo regardleſſe of my diſcourſe. Strange, that my ſorrowes ſhould be great enough to work aſtoniſhment, and yet not great enough to deſerve attention. O mark firſt what I ſuffer, and then what I ſpeak.

And (this once done) lay your hand upon your month] Be ſwift to hear but ſlow to ſpeak: yea, ſpare to ſpeak at all in this caſe. The Greek Proverb admoniſheth men either to be ſilent, or to ſpeak ſomething that is better then ſilence. Harpocrates the heatheniſh god of ſilence, was pictured with his finger laid upon his lips.