Valmiki Ramayana 5.9.12
परेण तपसा लेभे यत् कुबेरः पितामहात् ।कुबेरम् ओजसा जित्वा लेभे तद् राक्षस ईश्वरः॥
pareṇa tapasā lebhe yat kuberaḥ pitāmahāt |kuberam ojasā jitvā lebhe tad rākṣasa īśvaraḥ ||
Our plain-language meaning of this verse is waiting for scholar review.
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