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प्राणकामाः पुरा जीर्णाश्च्यवनाद्या महर्षयः । रसायनैः शिवैरेतैर्बभूवुरमितायुषः ॥ २० ॥
ब्राह्मं तपो ब्रह्मचर्यमध्यात्मध्यानमेव च । दीर्घायुषो यथाकामं संभृत्य त्रिदिवं गताः ॥ २१ ॥
तस्मादायुःप्रकर्षार्थ प्राणकामैः सुखार्थिभिः । रसायनविधिः सेव्यो विधिवत्सुसमाहितैः ॥ २२ ॥

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{"source": "Samhita : Charaka Samhita Part 2, Chapter :1, Sthanam :Chikitsasthanam, Shloka Number: 20 to 22", "explanation": "These verses (20-22) discuss the use of Rasayana therapies by ancient sages to achieve longevity and facilitate spiritual practices.  They highlight the importance of a holistic approach to well-being, where physical health supports spiritual growth.\n\n**Verse 20:** This verse introduces the concept of Rasayana as a tool for longevity. It mentions sages like Chyavana, who, despite their advanced age, desired vital strength (Prana) and achieved remarkably long lifespans through the use of beneficial Rasayana formulations.  The term \"Amitayusha\" suggests a lifespan beyond normal limits, emphasizing the potency of these therapies.\n\n**Verse 21:** This verse explains how these sages utilized their extended lifespans.  Having attained longevity, they dedicated themselves to spiritual practices like:\n\n*   **Brahma Tapa:** Penance or austerities performed with a focus on Brahman (the ultimate reality).\n*   **Brahmacharya:** Celibacy, practiced to conserve energy and focus on spiritual pursuits.\n*   **Adhyatma Dhyana:** Meditation focused on the self or the Atman (inner self).\n\nThrough these practices, they achieved spiritual liberation (Tridivam Gata), often interpreted as reaching higher planes of existence or enlightenment.\n\n**Verse 22:** This verse provides a general recommendation based on the sages' example. It states that individuals seeking longevity, vital strength (Prana), and happiness (Sukha) should utilize Rasayana therapies methodically (Vidhivat) and with focused attention (Susamahita). This emphasizes the importance of proper application and adherence to prescribed guidelines for optimal results."}
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