Answer:
The lesson learnt from the story is to be grateful to people who renders help to us.
Step-by-step explanation:
The lesson learnt from the story "His just reward" was that the reward for ungratefulness is death.
From the summary of the story, the snake refused to be grateful to the man who removed it from the crevis.
Instead of the snake thanking the man, the snake said to the man that the reward for removing it from the crevis is death.
The snake was being ungrateful to the man.
But in the end, the fox put the snake back in the crevis and tightened the crevis which killed the snake.
So you see, the snake died of it ungratefulness to the man that removed it from the crevis. It is always good to be grateful for whatever favour or help that we receive from someone. Always thank people for their help. Be grateful.