When we do something that feels good to us, we should do so without any "secret strings" of expectation. Whats important is we felt good irrespective someone does or doesn't respond to our gesture of goodwill. We should do these things without any "secret strings" of expectation attached to that goodwill that we send out.
When we cut the cord of expectation, and it frees up the energy to go where it may. Without having expectations, it is like freeing a bird's energy and allowing that bird to go where it wants to. But if we try to contain, control, or direct the energy of a bird, we would not get happiness or song from that bird. So when we release this energy of goodwill to anyone, we should do it for the sake of planting seeds of goodness... without expectation of anything in return.