Answer:
Be yourself.
Explanation:
Its basically saying that life is short, and you should not be wasting your whole life pretending to be someone else or making you seem like someone else, because its not gonna get you anywhere really, and you should just be yourself and people will most likely like you better!
The Greeks were the ones who mostly made up the myths and legends like the Greek gods then the Romans adapted their myths and changed them into their own but the answer is they did not know what to think of the world around them leaving them with the option of them making stories up to explain these things to themselves and their children