Shatapatha Brahmana · Chapter 14.8.8

śāṇḍilyavidyāgraṃthaḥ
manomayapuruṣopāsanābrāhmaṇam
manomayo'yaṃ puruṣo bhāḥsatyastasminnantarhṛdaye yathā vrīhirvā yavo vaivamayamantarātmanpuruṣaḥ sa eṣa sarvasya vaśī sarvasyeśānaḥ sarvasyādhipatiḥ sarvamidaṃ praśāsti yadidaṃ kiṃ ca ya evaṃ veda - १४.८.८