But renunciation, O mighty-armed one, is hard to attain without yoga. The sage who is disciplined in yoga reaches Brahman before long.
Explanation
Krishna continues answering Arjuna's question about whether to renounce action or practice disciplined action. He says renunciation (saṃnyāsa) is difficult without yoga, meaning steady, disciplined action done with a balanced mind. The sage (muni) who is established in such yoga quickly reaches Brahman, the ultimate reality. Traditions differ on whether yoga here is a necessary preparation for renunciation, as many Advaita readings take it, or a path equal in itself, as other readings take it.