The Mukhya Upaniṣads

Kauṣītaki · Adhyāya 4 · Kauṣītaki 4.1

Passage 20

तमेतमात्मानमेतमात्मनोऽन्ववस्यति यथा श्रेष्ठिनं स्वास्तद्यथा श्रेष्ठैः स्वैर्भुङ्क्ते यथा वा श्रेष्ठिनं स्वा भुञ्जन्त्येवमेवैष प्राज्ञात्मैतैरात्मभिर्भुङ्क्ते ।एवं वै तमात्मानमेत आत्मानो भुञ्जन्ति ।स यावद्ध वा इन्द्र एतमात्मानं न विजज्ञे तावदेनमसुरा अभिबभूवुः ।स यदा विजज्ञेऽथ हत्वासुरान्विजित्य सर्वेषां देवानां श्रैष्ठ्यं स्वाराज्यमाधिपत्यं परीयाय एवैवं विद्वान्सर्वान्पाप्मनोऽपहत्य सर्वेषां भूतानां श्रैष्ठ्यं स्वाराज्यमाधिपत्यं पर्येति य एवं वेद य एवं वेद ॥ २० ॥

In plain words

These selves depend upon that Self as retainers depend upon a chief. As a chief enjoys with his retainers, and as the retainers wait upon their chief, so this self of wisdom enjoys with these selves, and so these selves wait upon that Self. So long as Indra did not know this Self, the demons overcame him. But when he knew it, then, having slain and conquered the demons, he attained pre-eminence, self-rule and sovereignty over all the gods. And so, having struck away all evils, he who knows thus attains pre-eminence, self-rule and sovereignty over all beings — he who knows thus.