A man asked The Prophet(SAWW) to give him advice, and he (SAWW ) said, "Do not get angry." The man repeated that several times and he (SAWW) replied (every time), "Do not get angry." [Bukhari]
The Prophet (SAWW ) said: "You must be gentle. Verily, gentleness is not in anything but that it beautifies it, and it is not removed from anything but that it damages it." [Abu Dawud 4808].