For every hour spent in his study chair, he (the preacher) will have to spend two upon his knees. For every hour he devotes to wrestling with an obscure passage of Holy Writ, he must have two in the which to be found wrestling with God. Prayer and preaching: preaching and prayer! They cannot be seperated. The ancient cry was: "To your tents, O Israel!" The modern Cry should be: "To your knees, O preacher, to your knees!"
E.M Bounds, The Necessity of Prayer (online version, http://www.ccel.org/ccel/bounds/necessity.i.xv.html)