Bhagavad Gita 10.23 is Chapter 10, Verse 23, in Vibhuti Yoga (Divine Manifestations). Below are the Sanskrit text, a transliteration, a plain-English translation and an explanation.
rudrāṇāṁ śaṅkaraś cāsmi vitteśo yakṣa-rakṣasām vasūnāṁ pāvakaś cāsmi meruḥ śikhariṇām aham
"Among the Rudras I am Shankara (Shiva); among Yakshas and Rakshasas I am Kubera; among the Vasus I am fire; and among mountains I am Meru."
What This Means:
Among Rudras, Shiva. Among nature spirits, Kubera (lord of wealth). Among the Vasus, fire. Among mountains, Meru (the cosmic mountain at the world's center).
Going Deeper:
Krishna includes various divine categories: fierce (Rudras), subtle beings (Yakshas), elemental forces (Vasus), and geography (mountains). Everything reveals Him.
How To Apply This:
Look for the Divine in fierce things (Shiva), in wealth (Kubera), in transformation (fire), in stability (mountains). Every domain has its divine representative.
Key Sanskrit Terms: