一隻烏鴉口渴難忍，看到一隻水罐，就興衝衝地飛過去了。可是飛到水罐旁邊，烏鴉才發現水罐的水少得可憐。烏鴉絞盡腦汁，想了很多辦法，可是依然喝不到水。這時，烏鴉已經筋疲力盡了。偶然間，他看到水罐旁邊有很多小石頭，烏鴉終於想到了一條妙計。他用嘴銜住小石頭，然後將它們一顆顆地放進水罐裏，這樣石頭就會占據水的空間，水麵自然上升了。就這樣烏鴉如願以償地喝到了水。
自我需要是成功的動機。
A Cr with thirst saitd hoping to .o it with delight. Whe，he discovered to his grief that it ed so little water that he ot possibly get at it. He tried everythihink of to reach the water，but all his efforts were in vain. At last he collected as many stones as he could d dropped them oh his beak itil he brought the water withihus saved his life.
y is the mother of iion.