Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 31
Sanskrit:
तिष्ठन्तमासीनमुत व्रजन्तंशयानमुक्षन्तमदन्तमन्नम् ।स्वभावमन्यत् किमपीहमान-मात्मानमात्मस्थमतिर्न वेद ॥ ३१ ॥
ITRANS:
tiṣṭhantam āsīnam uta vrajantaṁśayānam ukṣantam adantam annamsvabhāvam anyat kim apīhamānamātmānam ātma-stha-matir na veda
Translation:
The wise man, whose consciousness is fixed in the self, does not even notice his own bodily activities. While standing, sitting, walking, lying down, urinating, eating or performing other bodily functions, he understands that the body is acting according to its own nature.