Should a wise man utter vain knowledge, and fill his belly with the east wind?
A wise man - which Job claims to be. Vain knowledge - Hebrew, windy knowledge-literally, 'of wind' (Job 8:2), In Ecclesiastes 1:14 х rª`uwt (H7469) ruwach (H7307)], Hebrew, to catch wind, expresses to strive for what is vain.
East wind - stronger than the previous "wind." For in that region the east wind is the most destructive of winds (Isaiah 27:8). Thus here-empty violence.
Belly - the inward parts, the breast (Proverbs 18:8).