@5a7416b4: Humanists use critical thinking and evidence-based reasoning to arrive at the concept of "human flourishing" as a fundamental precept because it is based on the idea that human beings have inherent worth and value, and that they have the capacity to live fulfilling and meaningful lives.

The concept of human flourishing is based on a wide range of empirical evidence from fields such as psychology, sociology, and neuroscience, which suggests that certain conditions are necessary for individuals to thrive and reach their full potential. These conditions may include access to education, healthcare, and basic human rights, as well as social connections, a sense of purpose, and the ability to pursue one's own interests and passions.

Humanists also believe that the pursuit of human flourishing is not just an individual concern, but a collective one as well. They argue that societies have a responsibility to create the conditions that allow individuals to thrive, and that this requires a commitment to social justice, equality, and the elimination of discrimination and oppression.

Overall, the concept of human flourishing is arrived at through a careful examination of the empirical evidence and a commitment to ethical and moral reflection. It is seen as a fundamental precept of humanism because it reflects the belief that human beings have the capacity to live fulfilling and meaningful lives, and that it is the responsibility of individuals and societies to work towards this goal.