"...towards being angered: if we are angry overmuch, we stand in a bad relation towards anger, whereas if we are not angry at all where we ought to be, in that case also we stand in a bad relation towards anger.
The mean state, then, is neither to be pained overmuch nor to be absolutely insensible. When we stand thus we are in a good disposition…
Similarly in the case of boastfulness and mock-humility. For to pretend to more than one has shows boastfulness, while to pretend to less shows mock-humility. The mean state, then, between these is truthfulness."
— Aristotle, Magna Moralia (1186a15-27)
furthermore:
"The man who is angry at the right things and with the right people, and, further, as he ought, when he ought, and as long as he ought, [is a] good-tempered man [but] he is not revengeful [and] tends to make allowances....nor fails to take sufficient delight when it is appropriate to do so."
— Aristotle, Nicomachean Ethics (1124b32-1126a3; 1151b23-27)