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As vāta and pitta are stabilized, the mind’s gunas, or qualities, must also be addressed. Known as the mahagunas, they are sattva, rajas and tāmas, developed in the ancient Indian system of philosophy called Sankhya. The lethargic or tāmasic guna is a necessary energy for the mind, as it needs to periodically disengage and rest. In excess, however, it promotes laziness, lethargy and depression. Rajas or the dynamic guna, promotes activity, curiosity and a do-er mentality, but it also promotes arrogance, egotistical narcissism and bullying. Sattva is the quality of harmony, balance and oneness with the environment. For more than half of our day, we should live with the quality of sattva dominating in our mind. However, too much sattva will prevent us from keeping boundaries from others and may lead to violations of our space by people who have not developed mentally and emotionally to be sattvic. Activities that cleanse the body of the tāmas, such as exercise, team sports and hiking in nature, are encouraged to dilute negative energies by infusing positive energies into the body through all inlets: food, sound, conversations, visual objects, smells, the sun and the environment that penetrates through our skin. As a person takes in the environment, it may change his/ her mental composition, as we know emotions can change neurotransmitters, which alter hormone levels and the immune system.
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Bhaswati Bhattacharya (Everyday Ayurveda: Daily Habits That Can Change Your Life in a Day)