Srimad Bhagavad Gita Chapter 2 Text 15
Excerpt Bhagavad Gita 2.15 by Bhaktivedanta Narayana Maharaja
Verse: O best among men, that sober person who remains undisturbed despite the dualities caused by sense perception, and who considers happiness and distress to be the same, is certainly qualified for liberation from the endless cycle of birth and death.
From Srila Narayana Maharajas purport
If a person properly deliberates on the influence of the sense objects and practises tolerance of them, these sense objects will not be the cause of misery when he experiences them. When the sense objects are no longer a cause of misery, one will naturally come closer to attaining liberation. Therefore, the verse beginning with "yam hi na" is being spoken. Here the word amrtatvaya means ‘liberation.
Excerpt Bhagavad Gita 2.15 by Bhaktivedanta Swami Prabhupada
Verse: O best among men [addressing Arjuna], the person who is not disturbed by happiness and distress and is steady in both is certainly eligible for liberation.
From Srila Prabhupadas purport
Anyone who is steady in his determination for the advanced stage of spiritual realization and can equally tolerate the onslaughts of distress and happiness is certainly a person eligible for liberation