I am Wilson. My sister and I spent our summer vacation with our uncle this year. He is a scientist and he loves to collect(收集)stones.
One day, he bought us two bags and asked us to go to the mountain with him. We walked all the time. Along the way, he put stones in our bags. To our surprise, he also took some stones out from our bags. We thought he had just found better stones.
When we got back home, we were very tired. The bag were so heavy that we felt relaxed when we took them off. But our uncle's bag was half empty.
"Why did you give us so many stones?" we asked. "I didn't. You did," he said. "You didn't know it but I gave you a little attitude test today. I listened to every word you said. Whenever you said bad words, I put a stone to your bags. Whenever you talked about something good, I took out a stone. And now look at your bags. "
Our bags were full of stones.
"Your bad feelings are just like stones. You put them in your mind just like those stones in your bags. The more sad feelings you have, the heavier your mind will be. " said our uncle.
With great love, our uncle taught us one of the most important lessons in life--the attitude toward our life.