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SB 1.5.3

jijñāsitaṁ susampannam
 api te mahad-adbhutam
kṛtavān bhārataṁ yas tvaṁ
 sarvārtha-paribṛṁhitam
Synonyms: 
jijñāsitam — fully inquired; susampannam — well versed; api — in spite of; te — your; mahat-adbhutam — great and wonderful; kṛtavān — prepared; bhāratam — the Mahābhārata; yaḥ tvam — what you have done; sarva-artha — including all sequences; paribṛṁhitam — elaborately explained.
Translation: 
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 Mahābhārata, which is full of all kinds of Vedic sequences elaborately explained.
Purport: 

The despondency of Vyāsadeva 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 Mahābhārata is compiled with full explanation of the Vedas.