After Kurukshetra war, Dhritrarashtra asked Krishna, “I had 100 sons. All of them were killed. Why? Krishna replied, “50 lifetimes ago, you were a hunter. While hunting, you tried to shoot a male bird. It flew away. In anger, you ruthlessly slaughtered the 100 baby birds in the nest. Father-bird had to watch in helpless agony. Because you caused that father-bird the pain of seeing the death of his 100 sons, you too had to bear the pain of your 100 sons dying.... Dhritarastra said, “Ok, but why did I have to wait for fifty lifetimes?” Krishna answered, “You were accumulating punya (pious credits) during the last fifty lifetimes to get 100 sons - because that requires a lot of punya. Then you got the reaction for the papa (sin) that you have done fifty lifetimes ago.” Krishna says in the Bhagavad-gita (4.17) "gahana karmano gatih". The way in which action and reaction works is very complex. God knows best which reaction has to be given at what tim...