Midrasch zu Kohelet 7:9

Rabba b. R. Huna said: "Whoever gets excited has no regard even for the Shechina, as it is said (Ps. 10, 4) The wicked, in the pride of his countenance (saith): 'He will not require; all his thoughts are, there is no God." R. Jeremiah of Diphti said: "He will even forget his studying and will increase in foolishness, as it is said (Ecc. 7, 9) For anger resteth in the bosom of fools; and again it is written (Pr. 13, 16) But a fool spreadeth abroad his folly." R. Nachman said: "It is known that the iniquities of such a man are more than his meritorious deeds, as it is said (Ib. 29, 22) A man of anger stirreth up strife, and a man of fury aboundeth in transgression."