Caesar didn’t see it so he ceased to exist
The warning referred to was made by a soothsayer who prophesied to Julius Caesar, “beware the Ides of March” (March 15th). He died that day in the year 44 B.C. from 23 stab wounds, one from each member of the Senate.
The most shocking blow came from Marcus Brutus, formerly a loyal follower of Caesar and, according to contemporary rumors, possibly his illegitimate son. Shakespeare, in his play Julius Caesar, depicts Caesar as whispering “Et tu, Brute?” (“You too, Brutus?”) epitomizing the betrayal. After that, Caesar reportedly hid his head in his toga and submitted to the attack.
Jay is pointing out that sometimes the person closest to you is the one that ends up doing you in. However, he seems to be learning from Caesar’s mistake.
Also, notice the amazing alliteration in this line.
Caesar didn’t see it so he ceased to exist.
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