Upaniṣads · Bṛhadāraṇyaka 5.6

Bṛhadāraṇyaka 5.6.1

मनोमयोऽयं पुरुषो भाःसत्यः ।
तस्मिन्नन्तर्हृदये यथा व्रीहिर्वा यवो वा ।
स एष सर्वस्येशानः सर्वस्याधिपतिः सर्वमिदं प्रशास्ति यदिदं किञ्च ॥ ५.६.१ ॥

This person is made of mind, radiant and true. Within the heart he is like a grain of rice or a grain of barley. He is the lord of all, the sovereign of all; whatever exists here, he governs it all.