Pastors often get discouraged thinking they could be 'more useful with more people'. Many Christians (pastor or otherwise) feel that they would be of much more effect if they could serve God somewhere that their gifts might make a greater impact. No one wants to waste their life. In that light I find this quote a powerful reminder that I am but a servant:
Notice God's unutterable waste of saints, according to the judgment of the world. God plants His saints in the most useless places. We say–God intends me to be here because I am so useful. Jesus never estimated His life along the line of the greatest use. God puts his saints where they will glorify Him, and we are no judges at all of where that is (Oswald Chambers, My Utmost for His Highest).
In light of all the purpose-driven madness in the church, it might be good to edit Chambers and note that the "judgement of the world" may now include "judgement of church growth experts."