Spurgeon on Burnout

What is the practical result of making yourself, as one man, responsible for the work of twenty men? Will you do any more? Will you do it any better? I saw a horse, this morning, which was pulling at a three-horse load. How he tugged! How he strained himself! I thought to myself, "There is a good horse being ruined. His master ought to take off part of his load, or else put more horses to pull with him." Does our Lord and Master treat us in this fashion? No; we overload ourselves. (C.H. Spurgeon, Exploring the Mind and Heart of the Prince of Preachers)