रजस्तमश्चाभिभूय सत्त्वं भवति भारत ।रजः सत्त्वं तमश्चैव तमः सत्त्वं रजस्तथा ॥
rajastamaścābhibhūya sattvaṃ bhavati bhāratarajaḥ sattvaṃ tamaścaiva tamaḥ sattvaṃ rajastathā
Now sattwa leads, having overpowered rajas and tamas, O Bharata; now rajas, having overpowered sattwa and tamas; and now tamas, having overpowered sattwa and rajas.
Gītā 14·10These three qualities of Nature are evidently present and active in all human beings and none can be said to be quite devoid of one and another or free from any one of the three; none is cast in the mould of one guna to the exclusion of the others. All men have in them in whatever degree the rajasic impulse of desire and activity and the sattwic boon of light and happiness, some balance, some adjustment of mind to itself and its surroundings and objects, and all have their share of tamasic incapacity and ignorance or nescience. But these qualities are not constant in any man in the quantitative action of their force or in the combination of their elements; for they are variable and in a continual state of mutual impact, displacement and interaction. Now one leads, now another increases and predominates, and each subjects us to its characteristic action and consequences.