What the Bible says about Israel's Turning Rigteousness into Bitter Wormwood
(From Forerunner Commentary)
What absurd things to suggest! They are impossibilities! Just as absurd is Israel's turning justice into poison and righteousness into bitter and sickening wormwood. Amos implies that though we may do something technical or mechanical that had previously seemed impossible—like plowing the sea—improving our morality is vastly more important.
John W. Ritenbaugh
Prepare to Meet Your God! (The Book of Amos) (Part One)