Ignorance of Scripture is the root of every error in religion, and the source of every heresy. - John Charles Ryle

All the simplicity in the world can do no good, unless you preach the simple Gospel of Jesus Christ so fully and clearly that everybody can understand it. If Christ crucified has not His rightful place in your sermons, and sin is not exposed as it should be, and your people are not plainly told what they ought to believe, and be, and do, your preaching is of no use.

[T]here is more to be learned at the foot of the cross than anywhere else in the world.

Where no visible fruit can be found, there you may be sure is no conversion.