Colonial era scholars questioned whether Sanskrit was ever a spoken language, or just a literary language. Scholars disagree in their answers. A section of Western scholars state that Sanskrit was never a spoken language, while others and particularly most Indian scholars state the opposite. Those who affirm Sanskrit to have been a vernacular language point to the necessity of Sanskrit being a spoken language for the oral tradition that preserved the vast number of Sanskrit manuscripts from ancient India. Secondly, they state that the textual evidence in the works of Yaksa, Panini and Patanajali affirms that the Classical Sanskrit in their era was a language that is spoken ("bhasha") by the cultured and educated. Some "sutras" expound upon the variant forms of spoken Sanskrit versus written Sanskrit. The 7th-century Chinese Buddhist pilgrim Xuanzang mentioned in his memoir that official philosophical debates in India were held in Sanskrit, not in the vernacular language of that region.