स्थितप्रज्ञस्य का भाषा समाधिस्थस्य केशव। स्थितधीः किं प्रभाषेत किमासीत व्रजेत किम् ॥

sthita-prajñasya kā bhāṣhā samādhi-sthasya keśhava sthita-dhīḥ kiṁ prabhāṣheta kim āsīta vrajeta kim

What the mark, of him who is stable of mind, steadfast in contemplation, O Keshava? How doth the stable-minded talk, how doth he sit, how walk?

In plain words: Arjuna asks Krishna (here called Keshava) to describe a person whose mind is calm and steady. How does such a person speak, sit and walk?