Mahabharata 20.9

रक्षोभिर्वध्यमानेषु दृश्यद्रव्येषु कर्मसु
आत्मस्थमात्मना तेन दृष्टमायतनं मया

Rakshobhirvadhyamaneshu drishyadravyeshu karmasu
Atmasthamatmana tena drishtamayatanam maya

Whole chapter