Seest thou a man that is hasty in his words?
Impetuosity of temper
The Adige at Verona appears to be a river quite broad and deep enough for navigation, but its current is so rapid as to make it quite unserviceable. Many men are so rash and impetuous, and at the same time so suddenly angry and excited, that their otherwise most valuable abilities are rendered useless for any good purpose. (C. H. Spurgeon.)