Karma moves in two directions. If we act virtuously, the seed we plant will result in happiness. If we act non-virtuously, suffering results.

Krishna  had all along been  with the  Pandavas.  Now everything over,  he left for  Dwarika.  On the way,  He met a saint named  Uttanka who asked  him  about the well-being  of the  Kauravas and the  Pandavas.  Krishna told  him all about the war and his help  for the victorious Pandavas. It enraged  the saint  who got ready to utter  a curse  on  Krishna  holding  him  responsible  for everything.  But  Krishna  appeared in the cosmic  form  and the saint  became  happy.  He asked a boon from  Krishna,  "Whenever  I need  water,  it  should be  available to me."

Shri  Krishna granted the boon  and  moved to  Dwraka.  A few days  later,  the saint,  while roaming in a forest felt  awful  thirsty.  As soon as he thought of water,  a low-caste man ( chandala )  appeared before him with  a mussuck (goat skin) of water.  He  was  clothed in dirty rags and some hounds were with him.  When the man offered  water  to the saint,  the saint responded with anger and refused to take the water.  The low-caste man disappeared and  Shri Krishna  appeared in his place.  He  told the saint that the man was none else  but  Lord  Indra   and the water  in  his  mussack  was   water  of  immortality.  The  saint  realized that his caste bias was not good for humanity.