The gospel is preached in the ears of all; it only comes with power to some. The power that is in the gospel does not lie in the eloquence of the preacher; otherwise men would be converters of souls. Nor does it lie in the preacher's learning; otherwise it would consist in the wisdom of men. We might preach till our tongues rotted, till we should exhaust our lungs and die, but never a soul would be converted unless there were mysterious power going with it - the Holy Ghost changing the will of man. O Sirs! We might as well preach to stone walls as to preach to humanity unless the Holy Ghost be with the Word, to give it power to convert the soul.
C.H. Spurgeon