यं हि न व्यथयन्त्येते पुरुषं पुरुषर्षभ। समदुःखसुखं धीरं सोऽमृतत्वाय कल्पते
yaṁ hi na vyathayantyete puruṣhaṁ puruṣharṣhabha sama-duḥkha-sukhaṁ dhīraṁ so ’mṛitatvāya kalpate
The hero whose soul is unmoved by circumstances, who accepts pleasure and pain with equanimity, is only fit for immortality.
Translated by Shri Purohit Swami
That firm man, whom surely these afflictions do not, O chief among men, to whom pleasure and pain are the same, is fit for attaining immortality.
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
yam—whom; hi—verily; na—not; vyathayanti—distressed; ete—these; puruṣham—person; puruṣha-ṛiṣhabha—the noblest amongst men, Arjun; sama—equipoised; duḥkha—distress; sukham—happiness; dhīram—steady; saḥ—that person; amṛitatvāya—for liberation; kalpate—becomes eligible