योऽयं योगस्त्वया प्रोक्तः साम्येन मधुसूदन। एतस्याहं न पश्यामि चञ्चलत्वात् स्थितिं स्थिराम् ॥

yo ’yaṁ yogas tvayā proktaḥ sāmyena madhusūdana etasyāhaṁ na paśhyāmi chañchalatvāt sthitiṁ sthirām

This yoga which Thou hast declared to be by equanimity, O Madhusûdana, I see not a stable foundation for it, owing to restlessness;

In plain words: Arjuna tells Krishna, whom he calls Madhusudana (slayer of the demon Madhu), that he cannot see how this yoga of staying calm and balanced could last. His mind is too restless to stay steady.