John Calvin Reformed @genevareformer

4. My heart was shaken. Others render it not amiss, “my heart wandered;” for excessive terror moves the heart, as it were, out of its place. He declares how sudden and unlooked for will be the destruction of Babylon, for a sudden calamity makes us tremble more than one which has been long foreseen and expected.

Matthew Henry Presbyterian @wholebiblehenry

We had one burden of Babylon before (ch. 13); here we have another prediction of its fall. God saw fit thus to possess his people with the belief of this event by line upon line, because Babylon sometimes pretended to be a friend to them (as Isa 39:1), and God would hereby warn them not to trust to that friendship, and sometimes was really an...

Commenting on Isaiah 21:1-10

John Gill Reformed Baptist @doctorgill

My heart panted,.... Fluttered about, and could hardly keep its place: or, "my mind wandered" (r); like a person in distraction and confusion, that knew not what to think say or do: fearfulness affrighted me; the terror of Cyrus's army seized him, of its irruption into the city, and of his being destroyed by it; the writing on the wall threw him into a panic...