heres. "Sherd," anything "serered". A piece of earthenware broken. Proverbs 26:23, "burning lips (lips professing burning love) and a wicked heart are like a potsherd (a fragment of common earthenware) silvered over with dross"; implying "roughness, dryness, and brittleness". Psalm 22:15, "my strength is dried up like a potsherd" or earthen vessel exposed to heat; the drying up of the vital juices caused Christ's excessive thirst (John 19:28). In Job 2:8 not a potsherd but an instrument for scratching is meant. Isaiah 45:9, i.e. whatever good one might promise himself from striving with his fellow creature of earth, to strive with one's Maker is suicidal madness (Isaiah 27:4).