What is the source of dhwani theory?

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The dhwani theory, which is a concept in Indian poetics regarding the aesthetic suggestion of words, is derived from the sphota theory. The sphota theory, primarily associated with the grammarian Bhartrihari, posits that the meaning of language is conveyed not through individual letters or sounds but through the sphota, an indivisible unit of meaning that is revealed or manifested through spoken or written language. The dhwani theory builds on this by suggesting that poetry has the ability to suggest meanings beyond the literal, through the aesthetic and emotional resonances of words.

What Is the Source of Dhwani Theory