The preacher's sharpest and strongest preaching should be to himself. His most difficult, delicate, laborious, and thorough work must be with himself.
Crucified preaching only can give life. Crucified preaching can come only from a crucified man.
We may excuse the spiritual poverty of our preaching in many ways, but the true secret will be found in the lack of urgent prayer for God's presence in the power of the Holy Spirit.