Patience

I don't mean to be that guy.But you know what they say patience is a virtue.I truly believe that too.Patience is something that you have work towards.Its takes self control to be patient and depending on the situation it could take alot of self-control.
For example you could be training someone to do a job. They may mess up alot and you may be frustrated with them.An impatient person may just fire them and hire a new person.While a patient one might  take the time to train them because they believe the person could do it.