PURPORT

Although Vedic knowledge is imperishable, within this material world it is sometimes manifest and sometimes not. When the people of this material world become too absorbed in ignorance, the Vedic knowledge disappears. Lord Hayagriva or Lord Matsya, however, always protects the Vedic knowledge, and in due course of time it is again distributed through the medium of Lord Brahma. Brahma is the trustworthy representative of the Supreme Lord. Therefore when he again asked for the treasure of Vedic knowledge, the Lord fulfilled his desire.