What is the moral lesson of man and serpent?

The story of "Man and Serpent" doesn't exist as a singular, well-known fable or tale. It's likely you're referring to a specific story or adaptation that you have in mind. To give you a proper answer, I need more context.

Could you please tell me:

* What version of the story are you referring to? Is it a specific book, movie, or folklore tale?

* What are the key elements of the story? Who are the man and serpent, and what happens to them?

Once I have this information, I can help you identify the moral lesson of the story you're interested in.