One farmer whose corn always received first prize at the local fair, used to share the best seed with all the villagers around.
When asked why, he said: It’s just a matter of interest. Wind carries pollen from one field to another. If my neighbors would grow low-quality corn, cross-pollination would reduce the quality of my corn. That’s why I always share with others the best seed I have.
Everything we give to others, we give to ourselves.
It is impossible to help others, and not helping ourselves in the same time.
It is also impossible to do harm to others while not doing harm to ourselves.