The preacher must be preeminently a man of prayer. His heart must graduate in the school of prayer. In the school of prayer only can the heart learn to preach. No learning can make up for the failure to pray. No earnestness, no diligence, no study, no gifts will supply its lack.
Talking to men for God is a great thing, but talking to God for men is greater still. He will never talk well and with real success to men for God who has not learned well how to talk to God for men. More than this, prayerless words in the pulpit and out of it are deadening words.
Edward M. Bounds, Power through Prayer (Oak Harbor, WA: Logos Research Systems, Inc., 1999).
I have just completed a new Small Group Bible Study on Prayer. It is part of the Good Questions Have Groups Talking subscription service. See https://www.mybiblestudylessons.com/