Bhagavad Gita · Sankhya YogaChapter 2, Shloka 55 (2.55)

Two things — giving up and being content. This shloka has two parts: (1) giving up all the desires of the mind at the root, (2) being content in the self, by the self.

A question and its answer (Shankaracharya). Shankaracharya raises a doubt: if all desires have been given up, no cause for contentment remains — won't such a person behave like a madman? Answer: ātmany eva ātmanā tuṣṭaḥ — he is independent of external gains, satisfied by the "nectar" of the vision of the highest truth; nothing else seems alam (enough) to him. The source of contentment has moved from outside to within.

Ramanuja — the peak of the discipline of knowledge. Ramanujacharya: taking support in the self alone, the mind is content in the self alone; through that very contentment, all other desires fall away. He says: jñāna-niṣṭhā-kāṣṭhā iyam — this is the highest limit of the discipline of knowledge. The next three shlokas (2.56–2.58) describe the stages one step below it, one by one.

Notice — the order is reversed: first contentment, then giving up happens by itself. Giving up is not forced; when a greater joy is found, smaller attractions fall away.