What is comprises our soul? Our mind, will and emotions. A healthy soul is paramount to a healthy body. The two are intimately intertwined and impossible to separate. The Bible talks about how important care for the soul is, and why.
Guard your heart (your soul, mind, will and emotions) with all diligence, for it is the wellspring of life. Proverbs 4:23
Finally, brothers, whatever is true, whatever is honorable, whatever is right, whatever is pure, whatever is lovely, whatever is admirable—if anything is excellent or praiseworthy--think on these things. Phil. 4:8