Maitri (Maitrāyaṇīya) Upaniṣad 5.1

5.1

dvidhā vā eṣa ātmānaṃ bibhartyayaṃ yaḥ prāṇo yaścāsāvādityo'tha dvau vā etāvāstāṃ pañcadhā nāmāntarbahiścāhorātre tau vyāvartete asau vā ādityo bahirātmāntarātmā prāṇo bahirātmā gatyāntarātmanānumīyate | gatirityevaṃ hyāha yaḥ kaścidvidvānapahatapāpmādhyakṣo'vadātamanāstanniṣṭha āvṛttacakṣuḥ so'ntarātmāgatyā bahirātmano'numīyate gatirityevaṃ hyāhātha ya eṣo'ntarāditye hiraṇmayaḥ puruṣo yaḥ paśyati māṃ hiraṇyavatsa eṣo'ntare hṛtpuṣkara evāśrito'nnamatti ||

Next follows Kutsâyana's hymn of praise:
'Thou art Brahmâ, and thou art Vishnu, thou art Rudra, thou Pragâpati, thou art Agni, Varuna, Vâyu, thou art Indra, thou the Moon.
Thou art Anna (the food or the eater), thou art Yama, thou art the Earth, thou art All, thou art the Imperishable. In thee all things exist in many forms, whether for their natural or for their own (higher) ends.
Lord of the Universe, glory to thee! Thou art the Self of All, thou art the maker of All, the enjoyer of All; thou art all life, and the lord of all pleasure and joy. Glory to thee, the tranquil, the deeply hidden, the incomprehensible, the immeasurable, without beginning and without end.'