John Trapp on Psalms 39:9

Verſ. 9. I was dumb. I opened not my mouth] Or, Better thus, I ſhould have been dumb, and not have opened my mouth, according to my firſt reſolution. I ſhould not have reaſoned, or rather wrangled with thee, as verſ. 4. but have kiſſed thy rod in an humble ſubmiſſion, and have known that the rod of Aaron, and pot of Manna muſt go together. Macrobius writeth that the image of Angeronia among the old Romans was placed on the Altar of Volupia, with the mouth cloſed and ſealed up; to ſignifie, that ſuch as patiently and ſilently bear their griefs, do thereby attain to greateſt pleaſures.

Becauſe thou didſt it] This is indeed a quieting conſideration, and will notably quell and kill unruly paſſions. Set but God before them, when they are tumultuating, and all will be ſoon huſht. This made Jacob ſo patient in the rape of his Daughter Dinah; Job, in the loſſe of his goods by the Sabaan ſpoylers; David, in the barkings of that dead dog Shim[illegible: 1 letter]i; that noble Lord of Pleſſis, in the loſſe of his only ſon, a Gentleman of marvellous great hopes, ſlain in the wars of the Low-Countries. His Mother more impatient, dyed of the grief of it: But his Father laid his hand on his mouth, when Gods hand was on his back; and uſed theſe very words, I was dumb, and opened not my mouth, becauſe thou didſt it.