यं हि न व्यथयन्त्येते पुरुषं पुरुषर्षभ ।
समदुःखसुखं धीरं सोऽमृतत्वाय कल्पते ।। २-१५ ।।

yaṃ hi na vyathayanty-ete puruṣaṃ puruṣarṣabha ।
sama-duḥkha-sukhaṃ dhīraṃ so'mṛtatvāya kalpate ।। 2.15 ।।

Whoever is not tormented by these, that wise
human, who is equanimous to sukha-duhkhas, is fit
for immortality, liberation.

Note: Life in the world means sukha-duhkhas alone,
nothing else. To nurture even-mindedness towards suhkhaduhkhas
makes one fit for gaining immortality, liberation.
What a great revelation!

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Profundity of Samatva