api te mahad-adbhutam
krtavan bharatam yas tvam
jijnasitam—fully inquired; susampannam—well versed; api—in spite of; te—your; mahat-adbhutam—great and wonderful; krtavan—prepared; bharatam—the Mahabharata; yah tvam—what you have done; sarva-artha—including all sequences; paribrmhitam—elaborately explained.
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.
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.
Link to this page: https://prabhupadabooks.com/sb/1/5/3