@papa-pepper, In my opinion Flesh is Mortal aspect and Spirituality is Immortal aspect and that's why both are two different subjects. And in my opinion we get the real peace through Spiritual Practices and we should understand that we are more in inner-self and less in outer. And if we want to improve our outer life and want to attain the peace then for sure we have to attain the Stability in Spiritual aspects.

Wishing you an great day and stay blessed. 🙂