Charles Ellicott Commentary Isaiah 33:2

"O Jehovah, be gracious unto us; we have waited for thee: be thou our arm every morning, our salvation also in the time of trouble." — Isaiah 33:2 (ASV)

O Lord, be gracious ... —Faith transforms itself into prayer. The prophet will still “wait” upon God. In the change of person, “their arm,” “our salvation,” we hear the very words of the prayer as it was spoken, the first referring to the soldiers who were to fight the battles of their country, the second to the non-combatants who were assembled with Isaiah in supplication.