PURPORT

The playful pastimes of the Lord caused suspicion in the mind of Lord Brahma, and therefore Lord Brahma, to test Krsna's Lordship, stole all the Lord's cows and cowherd boys with his own mystic power. Sri Krsna responded, however, by replacing all the cows and boys in the field. Lord Balarama's thoughts of astonishment at such wonderful retaliation are recorded in this verse (Bhag. 10.13.37).