Adhyāya 214: Tapas Redefined—Perpetual Discipline, Hospitality, and the Ethics of Eating (तपः-निरूपणम्, विघसाशी-अतिथिप्रिय-धर्मः)
तरुणाधिगतं ज्ञानं जरादुर्बलतां गतम् | विपक्वबुद्धि: कालेन आदत्ते मानसं बलम्
Knowledge gained in youth often wanes when one passes into the weakness of old age; but a person of ripened understanding, in due course, acquires a strength of mind by which that knowledge no longer diminishes.
भीष्म उवाच