Either led or driven, as we point the way.And having brought our treasure where we will,Then take we down his load, and turn him off
You may do your will;But he's a tried and valiant soldier.
Act 4 Scene 2
Judge me, you gods! Wrong I mine enemies?And if not so, how should I wrong a brother?
Most noble brother, you have done me wrong.
Act 4 Scene 3
In this I bury all unkindness, Cassius.
Fill, Lucius, till the wine o'erswell the cup.I cannot drink too much of Brutus' love.
Antony, Octavius, and Lepidus are deciding which senators to assassinate. When Lepidus leaves, Antony speaks about his dislike for Lepidus.
Act 4 Scene 3
No man bears sorrow better. Portia is dead.
What! Portia? O insupportable and touching loss!
While on the battlefield, a fight breaks out among Cassius and Brutus. They argue and accuse each other in private so as to not mislead their army.
Act 4 Scene 3
How ill this taper burns! Ha! who comes here?
Thy evil spirit, Brutus.
Titinius and Messala relay that Cicero has been killed, along with other senators. They finalize plans for battle at Philippi. Brutus and Cassius make up and restore their friendship.
Act 4 Scene 3
Go and commend me to my brother Cassius.Bid him set on his powers betimes before
Brutus informs Cassius of Portia's death. Cassius tries to speak about it with Brutus but he refuses to talk about it any further. 
After discussing battle plans, the men go to sleep when Brutus is awoken by Caesar's ghost, calling himself Brutus’ evil spirit. Brutus wakes the others, who noticed nothing.
Brutus tells Varro and Claudius to tell Cassius begin the march on Philippi first.