REPEAT TO YOURSELF THAT SUCH AND SUCH ARE ATMAN, THAT THEY ARE INFINITE, AND HOW CAN THEY HAVE ANY DISEASE ?

One must think of oneself as strong and invulnerable," and so forth — what does it all mean? Say, "Everything is in me, and I can manifest it at will." Repeat to yourself that such and such are Atman, that they are infinite, and how can they have any disease? Repeat this an hour or so, on a few successive days, and all disease and trouble will vanish into nought.

- Swami Vivekananda
25th September, 1894 NEW YORK
The Complete Works of Swami Vivekananda/Volume 6/Epistles - Second Series/XLVII Brother disciples