Read the excerpt below from act 5.1 of The Tragedy of Julius Caesar and answer the question that follows. BRUTUS:No, Cassius, no.Think not, thou noble Roman,That ever Brutus will go bound to Rome.He bears too great a mind. But this same dayMust end that work the ides of March begun;And whether we shall meet again I know not.Therefore our everlasting farewell take.For ever and for ever farewell, Cassius.If we do meet again, why, we shall smile.If not, why then, this parting was well made. CASSIUS:For ever and for ever farewell, Brutus.If we do meet again, we’ll smile indeed.If not, ‘tis true this parting was well made. Which theme do Brutus and Cassius explore in saying farewell to each other before they begin the battle with Octavius’ army?