For the source text click/tap here: Nedarim 22
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Rabbi Shmuel bar Nachmeini said in the name of Rabbi Yochanan: Whoever gets angry enables all kinds of Gehinnom to rule over him, as it is stated: and remove anger from your heart and remove evil from your flesh. The term “evil” refers to nothing but Gehinnom, as it is stated: Everything Hashem made was for His sake, and even the wicked one for the day of evil.
Moreover, he will suffer from hemorrhoids, as it is stated: and Hashem will give you there an angry heart, a longing of the eyes and suffering of soul.
We explore the rabbinic attitudes towards anger as well as the neurobiology and social aspects of anger.