यं हि न व्यथयन्त्येते पुरुषं पुरुषर्षभ ।समदुःखसुखं धीरं सोऽमृतत्वाय कल्पते ॥
yaṃ hi na vyathayantyete puruṣaṃ puruṣarṣabha |samaduḥkhasukhaṃ dhīraṃ so'mṛtatvāya kalpate ||
The person whom these contacts do not torment, O best among men, who stays steady and even-minded in pain and pleasure, is fit for immortality.
Explanation
Krishna continues advising Arjuna, who is overwhelmed by grief. Having said that sensations of cold, heat, pleasure and pain come and go, he now says that a steady person (dhīra) who stays balanced through them becomes fit for immortality (amṛtatva). Commentators across traditions take this immortality to mean liberation (mokṣa), freedom from the cycle of birth and death, rather than simply living forever.