The spiritual definition is that the sickest persons are the ones who are selfish, envious, idler, lustful, morbid, sadist, cruel, arrogant, or the ones who enjoy any evil. And besides, the one who does not have self respect and self appreciation and respect and appreciation for the world around.
Harmony, does not exist in illness, since this is mortification and the product of a difference of excess, giving place to lack of the elements needed for renovation or regeneration towards good health.
 The emphasis on this spiritual topic is that the mirror where good health is reflected is on happiness. And, the mirror where illness is reflected is on bitterness...continuation>