Bhagwad Gita
Chapter 14, Verse 10
रजस्तमश्चाभिभूय सत्त्वं भवति भारत।रजः सत्त्वं तमश्चैव तमः सत्त्वं रजस्तथा।।14.10।।
Sometimes the mode of passion becomes prominent, defeating the mode of goodness, O son of Bharata. And sometimes the mode of goodness defeats passion, and at other times the mode of ignorance defeats goodness and passion. In this way there is always competition for supremacy.