He doesn't say much about a cause, but he does say
"See what a scourge is laid upon your hate
That heaven finds means to kill your joys with love."
He does not say "It is the cause, my soul. Let me not name it to you, you chaste stars. It is the cause." That's Othello. And a pretty weird line it is too.
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The Prince in "Romeo and Juliet" enforces the law by decreeing that any further public violence between the Montagues and Capulets will result in death. He is determined to restore peace in Verona by holding both families accountable for their feuding.