I once heard a description of a football game: fifty thousand people who need exercise watching twenty-two men who desperately need rest.
Have you observed something similar in some churches? There might be several hundred spectators who need spiritual exercise watching a core group who desperately need rest.
Finally, have you also noticed some homes where one person is greatly overworked, while the other family members desperately need to learn what it means to serve?
“Seest thou a man diligent in his business? he shall stand before kings; he shall not stand before mean men” (Proverbs 22:29).