The purpose shared by both texts is to instruct with a moral lesson.
In Aesop's fable, the king's attempt to prevent fate ultimately leads to unintended consequences, illustrating the futility of trying to escape one's destiny. Similarly, in the excerpt from "Romeo and Juliet," Romeo's foreboding about the events of the evening suggests that one's fate is often unavoidable, and his speech hints at the tragic consequences that may arise. Both texts convey lessons about the nature of fate and the limitations of human control over it.