The one thing that hinders God is our unbelief.

From Mark 9:23-24:  “Jesus said to him, ‘If you are able!  All things can be done for the one who believes.’  Immediately the father of the child cried out, ‘I believe; help my unbelief!'”

F. B. (Frederick Brotherton) Meyer (1847-1929) was an English pastor, evangelist, and Christian writer.  He was heavily invested with inner city mission work in both his native country as well as the United States.