"Once upon a time there was a small time business man from a small village who used to sell butter in the nearby town. A big shop owner in the town was his regular customer.
The villager used to deliver every month the shop owner the required butter in 1 Kg. Blocks and in turn he used to get grocery items like sugar, pulses etc from the big shop owner.
Once the shop owner decided to weigh the butter and to his surprise every block of butter weighed 900 gms. instead of 1kg.
Next month when the villager came to supply Butter, the shop owner was very angry at him and told to leave the shop, to this the villager replied him courteously " Sir, I am a very poor villager, I don't have enough money to even buy the required weights for weighing the butter, I usually put the 1Kg sugar you give me on one side of Weighing scale and weigh butter on another side"
This simple story very beautifully illustrates that what we give to others comes back to us.