Bhagavad Gita 14.10

14.10 Now Sattva arises (prevails), O Arjuna, having overpowered Rajas and Tamas; nor Rajas, having overpowered Sattva and Tamas; and now Tamas, having overpowered Sattva and Rajas.

Sometimes the mode of goodness becomes prominent, defeating the modes of passion and ignorance, O son of Bharata. Sometimes the mode of passion defeats goodness and ignorance, and at other times ignorance defeats goodness and passion. In this way there is always competition for supremacy.