In Isaiah 28:28, the prophet asks rhetorically, 'Does one thresh grain forever?' The infinitive absolute form emphasizes continuous or intensive action. Threshing involved trampling grain with animals or sledges to separate kernels from chaff. Isaiah uses this agricultural wisdom to illustrate God's disciplinary purposes: just as a farmer doesn't thresh endlessly (which would crush the grain), so God calibrates judgment with wisdom, stopping before destruction becomes total.