If I never won souls, I would sigh till I did. I would break my heart over them if I could not break their hearts. Though I can understand the possibility of an earnest sower never reaping, I cannot understand the possibility of an earnest sower being content not to reap. I cannot comprehend any one of you Christian people trying to win souls and not having results, and being satisfied without results.
Charles Spurgeon, quoted in Don Whitney's Spiritual Disciplines for the Christian Life (p113)