SB 1.5.3
jijñasitam susampannam
api te mahad-adbhutam
krtavan bharatam yas tvam
sarvartha-paribrmhitam
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Your inquiries were full and your studies were also well fulfilled, and there is no doubt that you have prepared a great and wonderful work, the Mahabharata, which is full of all kinds of Vedic sequences elaborately explained.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The despondency of Vyasadeva was certainly not due to his lack of sufficient knowledge because as a student he had fully inquired about the Vedic literatures, as a result of which the Mahabharata is compiled with full explanation of the Vedas.