Anger is a temporary madness

https://howtobeastoic.wordpress.com/2018/02/20/stoicism-and-emotion-v-brutishness-and-insanity/

This includes people who get angry, which is why Seneca calls anger a “temporary madness.” This class of individuals can certainly be held morally responsible for their actions, since they are perfectly capable of reason, they just don’t use it well.

Once more, louder for those in the back: Stoicism is not about suppressing emotions. It is about [among other things] having appropriate emotional responses.