曾经看过这样一个故事:一个智者问一个正在种角豆树的人,“这种树多少年后才能结果?”种树人说:“七十年。”“哪你还能活七十年吗?”种树人是这样回答的:“我在世上见过角豆树,那是前人为我们栽种的,过去为我劳动,为什么我不该为未来劳动呢?” I have seen such a story: A wise man asks a person who is growing a carob tree, “How many years will it take for the tree to produce results?” The tree-planter said: “Seventy years.” “Where are you? Can you live for seventy years?”The tree planter responded like this:“I have seen carob trees in the world. It was planted by our predecessors and used to work for me. Why shouldn’t I work for the future? ”