The Vedanta Sutras of Badarayana: Second Adhyâya. Fourth Pâda.: II, 4, 4

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4. Because speech is preceded by that (viz. fire and the other elements).

Although in the chapter, 'That sent forth fire,' &c., the origin of the prânas is not mentioned, the origin of the three elements, fire, water, and earth only being stated, nevertheless, the fact of the text declaring that speech, prâna, and mind presuppose fire, water, and earth--which in their turn have Brahman for their causal substance--proves that they--and, by parity of reasoning, all prânas--have sprung from Brahman. That speech, prâna, and mind presuppose fire, water, and earth is told in the same chapter, 'For truly, my child, mind consists of earth, breath of water,