what did the poet amir khusrau write about the language ,knowledge and brahamanas?

In 14th century, the poet Amir Khusrau noted that there was “a different language in every region of this land: Sindhi, Lahori, Kashmiri, Dvarsamudri (in southern Karnataka), Telangani (in Andhra Pradesh), Gujari (in Gujarat), Ma‘bari (in Tamil Nadu), Gauri, (in Bengal) … Awadhi (in eastern Uttar Pradesh) and Hindawi (in the area around Delhi)”.

He went on to explain that in contrast to these languages there was Sanskrit which did not belong to any region. It was an old language and “common people do not know it, only the Brahmanas do”.