Final answer:
Marc Antony is the character who said the quote "O judgment, thou art fled to brutish beasts, And men have lost their reason! Bear with me, My heart is in the coffin there with Caesar, And I must pause till it come back to me," from Shakespeare's play Julius Caesar during his funeral oration.
Step-by-step explanation:
The quote you are referring to, "O judgment, thou art fled to brutish beasts, And men have lost their reason! Bear with me, My heart is in the coffin there with Caesar, And I must pause till it come back to me," is spoken by the character Marc Antony in William Shakespeare's play, Julius Caesar. This line is part of Antony's famous funeral oration in Act 3, Scene 2, where he speaks to the Roman public after the assassination of Julius Caesar. Antony's speech cunningly questions the motives of the conspirators and incites the crowd to revolt, which plays a pivotal role in the subsequent events of the play.