Bhagavad Gita
Chapter 4 · Verse 8
परित्राणाय साधूनां विनाशाय च दुष्कृताम्। धर्मसंस्थापनार्थाय सम्भवामि युगे युगे॥
paritrāṇāya sādhūnāṁ vināśāya ca duṣkṛtām, dharma-saṁsthāpanārthāya sambhavāmi yuge yuge
This continues the idea from the previous verse: every era finds a way to protect what's good and restore what has gone off balance.
To protect what's good and restore balance. That renewal happens again and again.