Why was the heart of the Prophet, peace and blessings be upon him, never angry?

The Messenger, peace and blessings be upon him, was a human being who would get angry and pleased, but his anger would not lead him away from the truth. Nothing emanated from him except truth, and he would not seek revenge for himself unless the sacred limits of Allah Almighty were violated. Indeed, he, peace and blessings be upon him, became angry on numerous occasions for the sake of Allah, such as his anger with Usamah when he sought to intercede for the Makhzumiyah woman who stole, and with Ali when he saw him wearing a silk garment, and with Mu'adh when he prolonged the prayer for his people.