Verse 4

नित्यमात्मदृशा लीनो ज्ञः स्वस्थश्चञ्चलोऽपि सन् ।क्षुब्धो दृश्यत एवासौ प्रतिबिम्बार्कवन्मुधा

In plain words

The knower, ever absorbed through the vision of the Self, is self-abiding even while he is in motion; he is indeed seen as agitated — but falsely, like the reflected sun.