As per modern medicine, a person is considered to be in good health if parameters connected to the various systems in the body are within normal range. If any other parameters go out of range, we consult a doctor to restore normalcy, failing which the body becomes diseased. Likewise, the mind should be full of good thoughtsWhen bad thoughts set in, the only way to cleanse the mind is by surrendering to the Guru and following His upadesa. If we do not do that, the mind gets corrupted