Bhagavad Gita · Sankhya YogaChapter 2, Shloka 64 (2.64)

"Tu" — but. This little word marks a contrast with 2.62–63. There, dwelling on sense objects led to downfall; here, even while living among sense objects, serenity is attained. The difference is not in the objects — it is in attachment and aversion.

Shankaracharya — attachment and aversion are natural. rāgaś ca dveṣaś ca rāga-dveṣau, tat-puraḥsarā hi indriyāṇāṃ pravṛttiḥ svābhāvikī — attachment and aversion; the activity of the senses naturally goes along with attachment and aversion. The seeker of liberation, with senses free of attachment and aversion, takes in sense objects that are avarjanīyān — unavoidable. Prasāda = prasannatā svāsthyam — serenity, wellbeing (being established in oneself).

Ramanuja — while treating sense objects as of no account. Ramanujacharya: (as in 2.61) fixing the mind on the Lord of all, with all impurities burnt away, he moves among sense objects with senses free of attachment and aversion — viṣayān tiraskṛtya vartamānaḥ — without giving the objects importance. Prasada = nirmalāntaḥkaraṇo bhavati — the mind becomes pure.

Madhusudana — removing a doubt. If dwelling on sense objects is itself the root of ruin, how will one who takes food and so on to stay alive escape ruin? Answer — with senses that are free of attachment and aversion, and under one's own control.