The Daily Motivator E-Mail Edition brings you a positive, motivational message like this every day in your email. I'm using to compose this message is powered by electricity. Electrons are constantly flowing into the computer, and back out. If the electrons were to only flow in, and not out, the computer would not work.
Electrical energy is useful only when it flows in both directions.
Water flows through pipes into my house. We use the water for drinking, bathing, washing dishes and clothes, and then the water flows back out. If the water were to only flow in, we would soon have a house full of water. If it only flowed out, we would soon be very thirsty and dirty. Similarly, giving and receiving are what make life's energy flow.