Vamanapurana 58.46

Vāmanapurāṇa 58.46

adṛśyamavyaktamacintyamavyayaṃ maharṣayo brahmayaṃ sanātanam /
vadanti yaṃ vai puruṣaṃ sanātanaṃ taṃ devaguhyaṃ śaraṇaṃ prapadye //