C.H. Spurgeon on the importance of earnestness in preaching:
Brethren, you and I must, as preachers, be always earnest in reference to our pulpit work. Here we must labor to attain the very highest degree of excellence. Often have I said to my brethren that the pulpit is the Thermopile of Christendom: there the fight will be lost or won. To us ministers the maintenance of our power in the pulpit should be our great concern, we must occupy that spiritual watch-tower with our hearts and minds awake and in full vigor. It will not avail us to be laborious pastors if we are not earnest preachers. We shall be forgiven a great many sins in the matter of pastoral visitation if the people's souls are really fed on the Sabbath-day; but fed they must be, and nothing else will make up for it. The failures of most ministers who drift down the stream may be traced to inefficiency in the pulpit.