מוסר אויף קהלת 11:10

And according to common sense, it is proper for man to love his body more than his money, and better dry bread with peace and rest than riches with heavy burdens and troubles ([paraphrasing] Proverbs 17:1). And if Hashem expands his border, he should find an outlet for his money to find rest for his body, and not toil in this world for the sake of monetary gain unless it is good for his body. And he will be a kindly man [who through this] benefits his soul (Proverbs 11:17), provided that he is not among the heavy drinkers of wine, gluttons of meat, eaters of royal dainties, excessively wasting days and nights, [or] excessively engaging in marital relations like roosters, for all these will consume both soul and body (Isaiah 10:18), as will be further explained in it’s [proper] place. And above all it is necessary to protect oneself from anger, as is written (Ecclesiastes 11:10): “banish anger from your heart, and do away with evil from your flesh.”

Accustom yourself to always speak all of your words calmly, to every man and at every time. In doing so you will prevent your anger from flaring, which is a bad attribute in a man which may cause him to sin. And accordingly said our Rabbis, may their memories be a blessing: (Nedarim 22a) "Anyone who gets angry - all of Gehinnom holds sway over him, as it says: (Kohelet 11:10) 'And remove the anger from your heart, and take away the bad from your flesh', and 'bad' can only mean Gehinnom, as it says (Proverbs 16:4): 'And the sinner, he too, will have his day of bad'."

Anger is a bad quality and just as scurvy is a disease of the body so is anger a disease of the soul. And our sages have said : "He who loses his temper is exposed to all the torments of hell" (Nedarim 22a) as it is said : "Therefore, remove vexation from thy heart, and put away evil from thy flesh" (Eccl. 11:10), and by "evil" they mean Gehenna, as it is said : "The Lord hath made everything for His own purpose, Yes, even the wicked for the day of evil" (Prov. 16:4). And not only this but an angry man is afflicted with piles as it is said : "The Lord will give you there an anguished heart and eyes that pine, and a despondent spirit" (Deut. 28:65). What ill is it that dims the eyes and pains the soul— Surely you will say "Piles".