Like one of those disaster sagas, I wonder if the people were numb at this point, hollowed of all feeling, the shock of these words landing like mallets on the taut head of a kettle drum.
The way Amos chose to depict himself was as a simple man minding his own business, tending to his farm and family, when God came barreling in with an urgent message
Moses was describing a basic principle of life, life goes well for us when living God's way, by God's law. Even for Job. In the middle of his story, life was awful. At the end of the book God not only restores Job's fortunes, they're even better than when the book starts out. Job successfully endured the ordeal God permitted in his life, and he was blessed.