Do good, have good
One day, a lion was sleeping under a tree in a forest. The wind was blowing. A mouse was walking over his body. The lion woke up and caught the mouse. The lion wanted to kill it. The mouse said : Dear King, I am a small animal, don't kill me. One day I can help you. The lion said : OK, you are free. The mouse thanked the lion and went home.
After some time, hunters caught the lion with ropes. He worked hard to cut the ropes but he couldn't. He shouted: Help! Help! The mouse heard the noise. It ran to the lion and cut the ropes with its teeth.
Soon the lion was free. He thanked the mouse for its help.
What is the main idea of the story?