Brutus:
"You are my true and honourable wife,
As dear to me as are the ruddy drops
That Visit my Sad Heart." As dear to me as are the ruddy drops
Brutus is speaking to Portia. She feels that he thinks that she is nothing more than his lover than his wife. He is trying to prove her otherwise.
It is essential to the scene because it gives us a look at a different side of Brutus.
Julius Caesar, Act II, Sc. II
Caesar:
"Cowards die many times before their deaths;
The valiant never taste of death but once."
Caesar is talking with Calphurnia about her nightmare of his death. He is saying that if he were to get scared and stay home he will end up losing more than if he goes out and faces the danger.
It's important because it's telling us that Caesar is not afraid of death, it's very ironic because of the fact that he dies later that day.