Kaṭha Upaniṣad 223

223

sūryo yathā sarvalokasya cakṣur na lipyate cākṣuṣair bāhyadoṣaiḥ /
ekas tathā sarvabhūtāntarātmā na lipyate lokaduḥkhena bāhyaḥ ///2,2.11 //

11. As the sun, the eye of all the world, is not tainted with the stains in external objects seen by the eyes, so, the one internal atman of all living things is not tainted with the world’s grief, being external to it.