There does not exist a single line of Tamil literature written before the Tamils came into contact with, and let us add accepted with genuine appreciation, the Indo-Aryan culture of North Indian origin.
Notes from Wikiquote
quoted in VEDIC ROOTS OF EARLY TAMIL CULTURE Michel Danino Written in 2001 and published in Saundaryashri: Studies of Indian History, Archaeology, Literature and Philosophy (Festschrift to Professor Anantha Adiga Sundara), P. Chenna Reddy, (ed.), Sharada Publishing House, New Delhi, 2009, pp. 19–30.