“It was claimed for Augustus Caesar that he found Rome a city of wood, and left it a city of marble. The pastor who succeeds in changing his people from a prayerless to a prayerful people, has done a greater work than did Augustus in changing a city from wood to marble. And after all, this is the prime work of the preacher. Primarily, he is dealing with prayerless people—with people of whom it is said, “God is not in all their thoughts.” Such people he meets everywhere, and all the time. His main business is to turn them from being forgetful of God, from being devoid of faith, from being prayerless, so that they become people who habitually pray, who believe in God, remember Him and do His will. The preacher is not sent to merely induce men to join the Church, nor merely to get them to do better. It is to get them to pray, to trust God, and to keep God ever before their eyes, that they may not sin against Him.
The work of the ministry is to change unbelieving sinners into praying and believing saints. The call goes forth by Divine authority, “Believe on the Lord Jesus Christ, and thou shalt be saved.” We catch a glimpse of the tremendous importance of faith and of the great value God has set upon it, when we remember that He has made it the one indispensable condition of being saved. “By grace are ye saved, through faith.” Thus, when we contemplate the great importance of prayer, we find faith standing immediately by its side. By faith are we saved, and by faith we stay saved. Prayer introduces us to a life of faith. Paul declared that the life he lived, he lived by faith in the Son of God, who loved him and gave Himself for him—that he walked by faith and not by sight.”
–E.M. Bounds in chapter 2 of The Necessity of Prayer