Musar su Proverbi 13:16

Our Sages said further : "He who loses his temper, even the Divine Presence, is unimportant in His eyes (Nedarim 22b), as it is written "The wicked in the pride of his countenance (saith) 'He will not require', All his thoughts are 'There is no God' " (Ps. 10:4). And it (anger) also causes him to forget his studies of Torah and increases his folly as it is said : "For anger resteth in the bosom of fools" (Eccl. 7:9) and "A fool will not understand" (Ps. 92:7), and, "But a fool unfoldeth folly" (Prov. 13:16). You may be sure that his sins are more plentiful than his merits, as it is said : "An angry man stirreth up strife" (Ibid. 29:22) and his punishment is very great as it is said : "A man of great wrath shall suffer punishment" (Ibid. 19:19).