"For my part, it was Greek to me"

This quote is from William Shakespeare's play Julius Caesar. It is spoken by Casca, a Roman senator, in action to a discussion between Cassius and Brutus. In the context of the play, Casca is stating that he does not understand what Cassius and Brutus are talking about. The phrase "it was Greek to me" is a metaphor for something that is incomprehensible or unintelligible. It is a reference to the fact that Ancient Greek was a language that was not widely comprehended in Shakespeare's time. By stating "it was Greek to me," Casca is suggesting that he does not understand the discussion between Cassius and Brutus. This expression has become a popular idiom in contemporary English, used to express confusion or absence of understanding.