Division and Dissemination of the Vedas...

Verse 1.4.20-24: Srila Vyasadev divided the vedas into four divisions. Paila Rsi became the professor of the Rg Veda, Jaimini the professor of the Sama Veda, and Vaisampayana alone became glorified by the Yajur Veda. Then other sages like Angira, Romaharsana etc. took portions of the Vedas and have carefully delineated and imparted the knowledge to the masses. This Romaharsana is the father of Srila Suta Goswami.

Going back, Romaharsana was giving a Bhagavatam lecture. That time Balaramji came there, but Romaharsana did not stand up. Then we all know how Balaramji punished him for this negligence.
Moral: Mere knowledge is not enough. Just reciting the Vedas is not enough. We need to understand that Krishna is to be known from the Vedas, that is their real purpose.

Some Upanishads speak of the impersonal form of Lord. That's why Krishna Himself in Bhagavad-gita, which is also known as Gitopanishad, tells us about the Personal Supreme Lord, Himself.

Krishna says in Bhagavad-gita that He is the owner of everything material and spiritual. Whoever understands this will surrender to Him.

The exalted devotees apply the knowledge of Srimad Bhagavatam is given in Caitanya Caritamrta. So these 3 books are enough for us, for us to go back to Godhead. All this is due to the mercy of Srila Prabhupada, coming in the succession of Caitanya Mahaprabhu.

That's why Chanting is the way. We should take it very seriously, if we are interested in self-realization. If we do that, it is very easy.