"Israel is no stronger than its capital, Samaria, and Samaria is no stronger than its king, Pekah son of Remaliah. Unless your faith is firm, I cannot make you stand firm." - Isaiah 7:9
There are so many "unless..." verses in the Bible. It seems that a walk of faith doesn't just encompass God's movement in our lives - it encompasses our movement that activates God's movement.
I've heard it said before, "God isn't moved by need; He is moved by faith."
Faith is always the prerequisite for God's activity in our lives, whether it be a miracle, healing, provision, or any kind of need we might have. God is moved by faith. It says in Hebrews 10:38, "The just shall live by faith."
In the time of Isaiah, two kings, King Rezin of Syria, and Pekah the King of Israel, set out to attack Jerusalem. King Ahaz of Judah was worried. But God sent a message from Isaiah saying, "This invasion will never happen; it will never take place... Unless your faith is firm, I cannot make you stand firm." Faith was a prerequisite for deliverance.
Is your faith firm in God? We have to be sure we keep our hearts aligned with God's in order to see His activity in our lives.