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But renunciation, O mighty-armed Arjuna, is hard to attain without Yoga; the Yoga-harmonised sage ickly goes to Brahman.

But renunciation, mighty-armed one, is hard to attain without yoga. The sage who is joined in yoga soon reaches Brahman.

Krishna explains why karmayoga is the better starting point. Renunciation (sannyāsa) without the training of yoga is difficult and leads to sorrow, because giving up action outwardly does not by itself still the mind. The muni, the contemplative, who is already disciplined by yoga reaches Brahman quickly. Many read this as saying that action done in the spirit of yoga purifies the mind and prepares it for true renunciation. The verse gives a practical reason for Krishna's preference: yoga makes renunciation real.