God explicitly says, “Call unto me, and I will answer.” There are no limitations, no hedges, no hindrances in the way of God fulfilling the promise. His word is at stake. His word is involved. God solemnly engages to answer prayer. Man is to look for the answer, be inspired by the expectation of the answer, and may with humble boldness demand the answer. God, who cannot lie, is bound to answer. He has voluntarily placed himself under obligation to answer the prayer of him who truly prays.