Mental peace is a key tool to subside desires, needs, aspirations ect. to minimal as required. This helps to orient our mind, body and mental stigma to sustain not only in the short term but the long term as well. It's sort of interdwindled with our mental balance and acts like our cerebellum/ear which ensures to maintain physical balance. But mental balance is our owness which comes with sustained practice. If we have issues with physical balance medication can cure it, we can see it in likes of specially abled people. The look on their faces and thier outlook towards life has minimal physical imbalances but mentally they are profound. Hence mental balance and patience to strive to attain the same become quintessential