Dhammapada Verse 25.21

Sanskrit Verse

आत्मा ह्यात्मनो नाथः आत्मा ह्यात्मनो गतिः । तस्मात् संयमयात्मानं अश्वं भद्रमिव वाणिजः ॥ २१॥

Bhikkhu Ānandajoti's translation

One is truly one’s own protector; one is truly one’s own refuge. Therefore one should control oneself even as the trader controls a noble steed.