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A positive mind is not created in a fine morning. It is a habit formed through the experiences from the infancy onwards. Perhaps this process starts from the time one is in the womb of the mother. The parents, other family members, neighborhood, overall health of the individual, education systems - everything –both internal and external-influence the further development of a positive mind. In the case of education, normally, it should ignite positive thinking. But information overloading shall upset this development. In majority of cases, information overloading during childhood shall lead to the creation of either over active minds with negative attitude or indifferent minds that make the individual behave like machines, because overloaded information spoils the space for creative thinking. Therefore, for a calm and pleasant life, we should see that it is not happening.
Practice it and make it a habit. Then the nature will make it sustainable by triggering necessary genetic engineering!