"Pride sullies the noblest character."

In the Shakespearean tragedy play, Julius Caesar, there are many lessons to be learned from having too much pride. Pride is a very dangerous character trait to have. Pride is the reason that Julius Caesar never got to rule. It cost him his very life. He first ignored the soothsayer that told him to beware the Ides of March. Caesar also ignored Artemidorus, who was trying to warn him of the people plotting to kill him. Pride prevented Caesar from paying attention to these warnings and the result of this was death. In real life, pride can cause you to lose friends, get a certain reputation, and many other negative things. 
(The quote used for the title belongs to Claudianus)