The Importance of Work-Life Balance
The work of Maslow, and his Hierarchy of Needs.
Broadly, Maslow says that people have needs, which had to be met in order. Before anything else can be considered, basic physiological needs such as food, water, and shelter must be provided. After that, people need to feel safe, and then to be loved and belong to a group.
They then move on to issues of self-esteem, cognitive needs, and aesthetic needs, and finally, at the top of the pyramid, there is self-actualization, or achieving your full potential as a human being.
What this means in practice is that work provides for basic needs: money earned provides food, and shelter and a regular income mean safety. Work also allows people to belong to a group, and doing well at work boosts self-esteem. The lower levels are all largely met through aspects of working.