Just a bad temper who could really be patient. Someone who can not feel angry can not be called a patient, because he just could not get angry. While one else actually feel angry, but to manage his anger to good effect and the fair is the one who managed to make himself be patient. And when you say that it is difficult to be patient, you are very precise, because our patience is measured by our power to keep putting that right in feeling that makes us as if entitled to apply beyond the boundary.
