The question requires a personal answer, based on your own life. For that reason, I can't write an answer for you, but I'll show you how to write it.
First, you read the entire poem and understand where the boy's happiness comes from. This happiness is the result of his attitude towards helping people because he believes that by making people happy, his family will also be happy and will also be helped.
In this case, your answer should be about a time when you helped someone and knew you would be rewarded in some way.
More information on how to write a personal experience at the link:
https://brainly.com/question/11013757