There are so many illnesses that have been diagnosed by special equipment.  Equipment designed to look into the smallest details of the human body and without these devices we would still be guessing, of course, illness is usually diagnosed by symptoms, which means that first one has to have a problem or illness, then they go from there.  Why not try preventative measures to stop the onset of sickness first?  All of this applies to the soul as well.  If there was a machine to detect our emotional illnesses then we could be immediately helped, but this is not the case.  So, the idea is to feed the soul beneficial thoughts and activities on a continual basis to build up resistance to trauma and stress that we encounter constantly.  Just a thought.   Love one another with kindness and tolerance.