Julius Caesar-Friendship

From this play I learned that friends should be chosen very carefully. Just because someone seems to be a good person doesn't mean that they are.
Julius Caesar thought that his friend Brutus was loyal, but Brutus turned against Caesar. He ended up helping in the plot to kill Caesar.
I also learned that staying loyal to your friends brings reward, while not being loyal to your friends brings consequence.
Brutus and Cassius, two men that helped in the plot to kill Caesar, later died, but Mark Antony, who did not help, was rewarded.