Faith is trust.
God responds to your faith. He doesn't respond to need. If that were true, God would wipe out sickness and poverty in the blink of an eye. Neither does God respond to our pleading. But God responds to the faith He sees in our heart---to those who are 100% committed to trusting Him in all situations, at all times and for all things.
James 1:6 says, "But when you ask, you must believe and not doubt because the one who doubts is like a wave of the sea, blown and tossed by the wind."
Faith is not about what we can do for God. Faith is about what God desires to do for you, in you, and around you. Faith is believing God will act in His infinite wisdom and power on your behalf.
The devil's fiery darts are no match for this kind of faith.