I read Power Through Prayer by E.M. Bounds in midsummer. I just found it under a pile of papers on my desk, and parusing through I see I marked up quite a few pages. Here are a few of my favorite quotes from the book:
"Preachers who are great thinkers, great students must be the greatest of prayers, or else they will be the greatest of backsliders, heartless professionals, rationalistic, less than the least of preachers in God's estimate."
"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."
"The preacher's study ought to be a closet, a Bethel, an altar, a vision, and a ladder, that every thought might ascend heavenward ere it went manward; that every part of the sermon might be scented by the air of heaven and made serious because God was in the study."
"God's revelation does not need the light of human genius, hte polish and strength of human culture, the brilliancy of human thought, the force of human brains to adorn or enforce it; but it does demand the simplicity, the docility, humility, and faith of a child's heart."
"Luther held it as an axiom: 'He who has prayed well has studied well.' We do not say that men are not to think and use their intellects; but he will use his intellect best who cultivates his heart most. We do not say that preachers should not be students; but we do say that their great study should be the Bible, and he studies the Bible best who has kept his heart with diligence."
"There is, I conceive, in the great laws of the moral world a kind of secret understanding like the affinities in chemistry, between rightly promulgated religious truth and the deepest feelings of the human mind. Where the one is duly exhibited, the other will respond."
"There was no eloquence - the honest man never dreamed of such a thing - but there was far better: a cordial communication of vitalized truth. I say vitalized because what he declared to others it was impossible not to feel he lived on himself."
"Earnestness is good and impressive; genius is gifted and great. Thought kindles and inspires, but it takes a diviner endowment, a more powerful energy than earnestness or genius or thought to break the chain of sin, to win estranged and depraved hearts to God, to repair the breaches and restore the Church to her old ways of purity and power. Nothing but holy unction can do this."
Get a copy of this book! I would guess your pastor has a copy he'd let you borrow.