We are taught early to reciprocate: if someone does something nice for you, you do something nice for them. If someone inspires you, you wish to inspire them. Reciprocity is important and great but it can be constraining: it means that we limit our focus on those who we do good for. Don’t try to impress the people who inspire you: turn around and inspire others. If someone sends you a surprise postcard do the same for someone else. That way goodness spreads and is not finished after two interactions.