Neva (service) is something that is needed by other people.
Suppose you are carrying a weight, heavy luggage, and you cannot carry anymore, then you look here and there, you want someone to help you, don’t you? See, we are all interdependent. Everybody needs some help from somebody and doing that help without expecting anything in return is siva.
Without seva nothing can happen on this planet, isn’t it? By seva, don’t think you are changing the world. Seva you do, because you can’t but do it. It’s in your nature. If you are good, if you are loving, if you are happy, you can’t but do seva. And when you are unhappy, if you do seva, you become happy.