From C.H. Spurgeon

Reflect on the quote from C. H. Spurgeon (Lectures to My Students, Grand Rapids: Zondervan, 1954, 32.): “We must feel that woe is unto us if we preach not the gospel; the word of God must be unto us as a fire in our bones, otherwise, if we undertake the ministry, we shall be unhappy in it, shall be unable to bear the self-denials in it, and shall be of little service to those among whom we serve.”

This quote seems like it is speaking of the motivation to be called to ministry. One must not go into the ministry because he/she "likes working with teens", or enjoys the social aspects of ministry, but one must only follow the call into ministry if there exists a burning desire to see the Gospel of Jesus Christ proclaimed to all. It is Christ and Christ alone that we serve in ministry, and when ministry's focus changes from Christ to selfish ambition or vain conceit, it only becomes a discouraging and frustrating endeavor.