But what kind of men does the Master mean to use? . . . First, they must be laborers. The man who does not make hard work of his ministry will find it very hard work to answer for his idleness at the last great day. A gentleman who wants an easy life should never think of occupying the Christian pulpit, he is out of place there, and when he gets there the only advice I can give him is to get out of it as soon as possible. . . . An idler has no right in the pulpit. He is an instrument of Satan in damning the souls of men.
The ministry demands brain labor; the preacher must throw his thought into his teaching, and read and study to keep his mind in good trim. He must not weary the people by telling them the truth in a stale, unprofitable manner, with nothing fresh from his own soul to give force to it. Above all, he must put heart work into his preaching. He must feel what he preaches: it must never be with him an easy thing to deliver a sermon, he must feel as if he could preach his very life away ere the sermon is done. There must be soul work in it, the entire man must be stirred up to effort, the whole nature that God has endowed him with must be concentrated with all its vigor upon the work in hand. Such men we want. To stand and drone out a sermon in a kind of articulate snoring to a people who are somewhere between awake and asleep must be wretched work.
I wonder what kind of excuse will be given by some men at last for having habitually done this. To promulgate a dry creed, and go over certain doctrines, and expound and enforce them logically, but never to deal with men’s consciences, never to upbraid them for their sins, never to tell them of their danger, never to invite them to a Savior with tears and entreaties! What a powerless work is this! What will become of such preachers? God have mercy upon them! We want laborers, not loiterers. We need men on fire, and I beseech you ask God to send them. The harvest never can be reaped by men who will not labor; they must off with their coats and go at it in their shirt-sleeves; I mean they must doff their dignities and get to Christ’s work as if they meant it, like real harvest men. They must sweat at their work, for nothing in the harvest field can be done without the sweat of the face, nor in the pulpit without the sweat of the soul.
Charles Spurgeon, sermon entitled “Harvest Men Wanted,” on Matthew 9:37,38, 10:1. Metropolitan Tabernacle Pulpit Volume 19, page 462