Studies made in 1953,1984,1990,1993 and 2002 suggest that positive thinkers are more likely than negative thinkers to stay
Impact of Positive Thinking
healthy into middle age and to have successful careers. They are half as likely to quit their jobs, 30 times more likely to be happy - and on average add 7.5 years to their life span.
The Principle of Self-Efficacy:
Psychologists have identified what is termed "self-efficacy", that is hiw confident a person feels about their effectiveness.
It has been found that self-efficacy levels influence motivation and how well people tackle a task. It has also been shown that people with high self-esteem feel more positive in general.