By him therefore let us offer the sacrifice of praise to God continually, that is, the fruits of our lips giving thanks to his name. (Hebrews 13:15)
Many of us work tirelessly to save money, provide for our families and if we are successful we reach a point where we can withdraw some of that money and use it.
It is the same with God. As people of faith we are always making deposits in our accounts with God and then a day comes where we have to make a withdrawal. Because we have spent time making those deposits, God is willing to meet our demands. He fulfills the needs of His faithful.