"This individual soul is unbreakable and insoluble, and can be neither burned nor dried. He is everlasting, all-pervading, unchangeable, immovable and eternally the same." BG 2.24
https://prabhupadabooks.com/bg/2/24
Remembering this means no anxiety. Whatever unhappiness is there is due to thinking I am this temporary material body. It is inevitable that I will be unhappy if I think like that. Since the body is destined for old age, disease and ultimately death. Knowledge of the difference between spirit and matter is the beginning of spiritual life. This is a part of a description of the characteristics of the spiritual energy. Spiritual energy is distinctly different from material energy which always comes with planned obsolesce built into it.
