naitac citram bhagavati
hy anante jagad-isvare
ota-protam idam yasmims
tantusv anga yatha patah
My dear Pariksit, that Lord Balarama killed Dhenukasura is not such a wonderful thing, considering that He is the unlimited Personality of Godhead, the controller of the entire universe. Indeed, the entire cosmos rests upon Him just as a woven cloth rests upon its own horizontal and vertical threads.
Unfortunate persons cannot appreciate the blissful pastimes of the Supreme Lord. In this connection Srila Jiva Gosvami explains that the Supreme Lord possesses unlimited potency and strength, as expressed here by the word anante. The Lord exhibits a tiny fraction of His power according to the need of a particular situation. Lord Balarama desired to vanquish the gang of demoniac asses who had unlawfully seized the Talavana forest, and therefore He exhibited just enough divine opulence to easily kill Dhenukasura and the other demons.