PURPORT

The Vedas (Svetasvatara Upanisad 6.8) assert that the Supreme Personality of Godhead has nothing to do personally (na tasya karyam karanam ca vidyate) because He is doing everything through His energies and potencies (parasya saktir vividhaiva sruyate). Nonetheless, here we see that He took personal care to find the calves of His friends. This was Krsna's causeless mercy. Mayadhyaksena prakrtih suyate sa-caracaram: all the affairs of the entire world and the entire cosmic manifestation are working under His direction, through His different energies. Still, when there is a need to take care of His friends, He does this personally. Krsna assured His friends, "Don't be afraid. I am going personally to search for your calves." This was Krsna's causeless mercy.