The story goes that two friends were walking through the desert. During some point of the journey they had an argument, and one friend slapped the other one in the face.
话说两个好朋友正在穿越一个沙漠。途中他们忽然争吵了起来,其中一个一巴掌扇在另外一个人的脸上。
The one who got slapped was hurt, but without saying anything, he wrote in the sand: "Today my best friend slapped me in the face."
被扇的那个人受了伤害,但他一句话也没有说,只是在沙子上写道:“今天我最要好的朋友打了我一个耳光。”
They kept on walking until they found an oasis, where they decided to take a bath. The one who had been slapped got stuck in the mire and started drowning, but the friend saved him.
The other friend replied: "When someone hurts us we should write it down in the sand where winds of forgiveness can erase it away. But when someone does something good for us, we must engrave it in a stone where no wind can ever erase it."