Śatapatha Brāhmaṇa ("of a hundred paths") 3.2.4.11

3.2.4.11

sa juhoti | jūrasītyetaddha vā asyā ekaṃ nāma yajjūrasīti dhṛtā manaseti manasā vā iyaṃ vāgdhṛtā mano vā idam purastādvāca itthaṃ vada maitadvādīrityalaglamiva ha vai vāgvadedyanmano na syāttasmādāha dhṛtā manaseti

He offers, with the text, 'Thou art the singer of praises,'--for this (word 'gûh'), the 'singer of praises,' is one of her (Vâk's) names;--'upholden by the Mind,'--this speech of ours is indeed upheld by the mind, because the Mind goes before Speech (and prompts her), 'Speak thus! say not this!' for, were it not for the Mind, Speech would indeed talk incoherently: for this reason he says, 'Upholden by the Mind.'