The hardest arithmetic to master is that which enables us to count our blessings.- Eric Hoffer
世界上最難的算術題是如何清點我們的祝福。

According to legend, a young man while roaming the desert came across a spring of delicious crystal-clear water. The water was so sweet, he filled his leather canteen so he could bring some back to a tribal elder who had been his teacher. 
據傳說，一個年輕的男子在漫游沙漠途中看到一泉如水晶般清澈而可口的水。水的味道非常甜美，于是他灌滿了他的皮水壺，這樣就可以帶一些回去，送給曾經是他老師的部落長老。

After a four-day journey he presented the water to the old man who took a deep drink, smiled warmly and thanked his student lavishly for the sweet water. The young man returned to his village with a happy heart. 
經過四天的旅程，他把水呈獻給老人。老人深飲一口，和藹地笑了笑，并深切感激學生贈予他甜美的水。年輕人懷著愉快的心情回到了村莊。

Later, the teacher let another student taste the water. He spat it out, saying it was awful. It apparently had become stale because of the old leather container.
后來，老師讓他的另一個學生品嘗水。學生吐了出來，說水太難喝了。它顯然已經因為陳舊的皮革容器而變得不再新鮮。

The student challenged his teacher: "Master, the water was foul. Why did you pretend to like it?"
學生質疑他的老師：“師父，水是臭的，你為什么要假裝喜歡它？”
學生質疑他的老師：“師父，水是臭的，你為什么要假裝喜歡它？”