"What you are emotionally is what you are"!
We are such emotional creatures that our emotions can influence every area of our lives. No matter how intelligent a person is, when he gets emotionally upset he cannot think in an orderly fashion. Emotions can break his concentration and stifle his creativity.
Everyone has had the experience of letting their emotions impair their judgement. How often have you asked, "Why did I marry him? We have nothing in common. " Why did I buy that car, house, dress etc.?" You know better but you did it anyway. The good life is one in which your mind controls your emotion not vice versa.
Our emotions are particularly powerful between the ages if fourteen and twenty-four. Doctors tell us that 65-80 percent of all illnesses are emotionally induced. Good emotion seem to have a healthy effect on us, bad emotions destroy us.
Source: WHY YOU ACT THE WAY YOU DO- TIM LAHAYE