Perfect knowledge for human beings, as well as all living entities, is contained in the Vedas. All the above-mentioned great personalities are not only powerful — being cognizant of past, present and future — but are also devotees. Still, in spite of their great education in knowledge, and despite their meeting the Supreme Personality of Godhead, Lord Viṣṇu, they cannot actually understand the perfection of the living entity’s relationship with Lord Viṣṇu.