The amorphous collection of texts that might be labeled “Hindu scripture” consists of millions of lines of text written over thousands of years in several languages. They cover diversified topics such as: Philosophical treatises, folk medicine, erotic poetry, and grammar tomes, as well as devotional hymns, liturgical manuals, and ethical instructions.
Many languages have become extinct. So, we miss lot of original scriptures.
Even vedic age texts are not originally written in Sanskirit. There are many languages like Pali; Prakrit; Devanagarika; Tamil; Kannada; Telugu; Sauraseni; Magadhi; Maharashtri; Kucheo; Brajbhasa, Bundeli; Awadhi; Marwari; Maithili; Bhojpuri; and Magahi. There are many ancient scripts and originals are in different scripts such as: Brahmiscript; The Kharoṣṭhior Gandhariscript; Siddhaṃ script; Gupta script; Bhujimol script; Kalinga script. Kashmiri had an appropriate and precise script of its own in Sharda used by sankara.