Why does God intervene so decisively? The word 'Therefore' at the start of the verse connects this promise to something crucial that happened just before.
The word 'Therefore' in Isaiah 37:33 isn't just a simple connector; it points back to the fervent prayer of King Hezekiah and the people (Isaiah 37:14-20). After Sennacherib's blasphemous threats, Hezekiah didn't rely on his own strength or political maneuvering. Instead, he brought the situation before the LORD.
God's response, detailed in this verse, is a direct answer to that prayer. It demonstrates that human prayers, especially those offered in deep distress and reliance on God, are heard and acted upon by the Almighty. This wasn't a random act of protection; it was a covenant response to faith in action.