Śatapatha Brāhmaṇa ("of a hundred paths") 7.5.2.52

7.5.2.52

samudre tvā sadane sādayāmīti | mano vai samudrā manaso vai samudrādvācābhryā devāstriyīṃ vidyāṃ nirakhanaṃstadeṣa śloko 'bhyukto ye samudrānnirakhanandevāstīkṣṇābhirabhribhiḥ sudevo adya tadvidyādyatra nirvapaṇaṃ dadhuriti manaḥ samudro vāktīkṣṇābhristrayī vidyā nirvapaṇametadeṣa śloko 'bhyukto manasi tāṃ sādayati

'In the ocean, the seat, I settle thee!' the sea is the mind; from the mind-ocean, with speech for a shovel, the gods dug out the triple science. Thereto this verse applies,--'May the true god know this day where the gods placed that offering, they who dug it out from the ocean with sharp shovels;'--the ocean is the mind, the sharp shovel is speech, the offering is the triple science: it is thereto this verse applies. In the mind he settles this (brick).