SB 10.36.15
evam kukudminam hatva
stuyamanah dvijatibhih
vivesa gostham sa-balo
gopinam nayanotsavah
Translation:
Having thus killed the bull demon Arista, He who is a festival for the gopis’ eyes entered the cowherd village with Balarama.
Purport:
This verse exemplifies the sublime contrast of spiritual qualities within Sri Krsna. In one four-line verse we simultaneously learn that Lord Krsna killed a powerful and wicked demon and that His boyish beauty gave festive pleasure to His young girlfriends. Lord Krsna is as hard as a thunderbolt or as soft as a rose, depending on our attitude toward Him. The demon Arista wanted to kill Krsna and all His friends, so the Lord beat him into a wet rag and killed him. The gopis, however, loved Krsna, and thus the Lord boyishly reciprocated their conjugal feelings.