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Maha Periavaal gives extensive explanations as to why it is pointless to investigate the origin or source of Vedas or gods. The 4 Vedas and the Upanishads are known as the "Sruti" that which was heard or seen and not created. That is why it is called Anadi or timeless because their sounds are constantly etched in space and which can never be destroyed. There is no need to determine if the Vedas preceded the Paramatman or the other way around because the Vedas are known as the breath of the Paramatman. Though the universe is created and destroyed many times the sound of the Vedas is never destroyed as it is constantly in space. The various rishis through the strength of their tapas realized these Vedas like a flash or a intuition. That is why they are called "mantradrashtas" and not "mantrakartas". Same reason why the Vedas are called "Sruti" - seen, realized and apauresheya (ie) divine and not man-made. In contrast the Puranas, Dharmashastras are called "Smiriti" or man-made.

The Maha Periavaal says beautifully, the Puranas enforce through stories what is said in the Vedas. For ex, Taitrio Upanishad says "Satyam Vadha" (speak the truth always) exemplified by stories from Harichandra. It also says "Dharmam chara" (Follow Dharma) exemplified by Yudhistira in Mahabharata. The Puranas are supposed to be taking place in each creation with slight variations. He says this கால ஆராய்ச்சி is not right in our religion as even the rishis of lore were not the creators of the Vedas. The Vedas itself was a oral tradition just before the advent of the kali. Everything is attributed to the Paramatma who resides in us as well.

For detailed explanations please read "Deivathin Kural" - 2nd part under the chapters "Vedas" and "Puranas"