I ran into an old friend on Saturday who told me she passed on a gift I had given her about 10 years ago. When she was a student she had a Christmas where I helped her out with some money because she was as poor as I've been as a student. And to be honest, I hadn't remembered the gift. But she had, and passed it on and told the person what I told her 'not to pay her back but to pass it forward'.
It only takes a spark to get a fire going.