tasmin sva ÄÅ›rame vyÄso
badarÄ«-á¹£aṇá¸a-maṇá¸ite
ÄsÄ«no 'pa upaspṛśya
praṇidadhyau manaḥ svayam
Narada had instructed Vyasa to remember the pastimes of the Lord continually in samadhi (SB 1.5.13). Thus he sat and concentrated using his mind.