Why is sound mind in a short but full description of happy state this world?

It's not entirely accurate to say that a "sound mind" is the full description of a happy state in this world. While mental well-being is crucial for happiness, it's only one piece of the puzzle.

Here's a more complete picture:

* Sound mind: This implies mental clarity, stability, and resilience, which are essential for experiencing happiness.

* Other crucial aspects: Alongside a sound mind, factors like meaningful relationships, fulfilling work, a sense of purpose, physical health, and a positive outlook all contribute significantly to happiness.

Essentially, a "happy state" is a holistic experience that encompasses a well-balanced combination of mental, emotional, physical, and social well-being. It's not simply about a sound mind but about a healthy and flourishing life in all aspects.