Drawing from history, the quote from Shakespeare's tragedy Julius Caesar (1599) is a warning uttered by a soothsayer who is letting Roman leader Julius Caesar know that his life is in danger, and he should probably stay home and be careful when March 15th, the Ides of March, rolls around.
In 44 BC, March 15th did become notorious as the date of the assassination of Julius Caesar which made the Ides of March a turning point in Roman history. Talk about a rough day in politics....Ceaser is stabbed to death in the Roman Senate house by 60 conspirators led by Marcus Junius Brutus (here we also get the term et tu Brute from Shakespeare meaning "even you Brutus")
So beware or be square,
or just don't care, it's up to you!