Principle 8 - Promote sustainable development

"Agile processes promote sustainable development. The sponsors, developers, and users should be able to maintain a constant pace indefinitely."

This principle too aims at employee welfare as well as stakeholder welfare in general. Hence, it is important that the team does not overpace or overachieve in the first few sprints if the entire agile development is supposed to take a much longer time. Even though there are several sprints, the entire development process is a marathon.