In 1992 Frederick Herzberg wrote a new introduction to his 1959 classic, The Motivation to Work (which you can find here),
“In The Motivation to Work and in all subsequent studies, achievement or quality performance has been the most frequent factor leading to job satisfaction. In other words, we found that behaviour or performance leads to satisfaction and positive attitudes. We had assumed, like most other researchers at the time, that FAE units (factors, attitudes, effects) would show that attitude leads to behaviour.” (Emphasis mine)
Happy people don’t do good work, people who do good work are happy.