Mahabharata 12.171.38

अतत्त्वज्ञोऽसि बालश्च दुस्तोषोऽपूरणोऽनलःनैव त्वं वेत्थ सुलभं नैव त्वं वेत्थ दुर्लभम्

atattvajño'si bālaśca dustoṣo'pūraṇo'nalaḥnaiva tvaṃ vettha sulabhaṃ naiva tvaṃ vettha durlabham

Our plain-language meaning of this verse is waiting for scholar review.