Samavedabrahmananyashtau 45.26

Sāmavedabrāhmaṇānyaṣṭau 45.26

vṛddhā vā eta indriyeṇa vīryeṇa yadvrāta indriyaṃ vīryaṃ
chandām̐sīndriyeṇaivainānvīryeṇa samarddhayati