Aphorism 199: “Disease will always return to the body if the soul is flawed; for the sins of the mind are the secret cause of the sins of the body. So too poverty and trouble will always return on man in society, so long as the mind of the race is subjected to egoism.”
It means that it is not enough to correct the outer causes of diseases and rectify the social ills by outer means. The roots of these things are to be found in the human mind and the inability of the soul to assert itself over nature. Strengthening the soul, purifying it off the covers of ignorance and egoism is therefore the right way to address these maladies.