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The three gunas [qualities] happen: sattva, rajas and tamas. These three gunas come in cycles into our life. When sattva comes, there is alertness, knowledge, interest, joy, happiness – everything comes. When rajo guna comes there is more desire, feverishness, restlessness, and sadness. When tamo guna comes delusion, attachment, lack of knowledge, lethargy – all these come.
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