Spread love everywhere you go: First of all in your own house … kindness in your face, kindness in your eyes, kindness in your smile, kindness. –Mother Teresa
Love is the message of the Heart Chakra and we bow in homage to it. The element of Anahata, the Heart Charka, is air. Air spreads and energizes. Like water, air assumes the shape of whatever it fills. We naturally imitate the people around us, we adopt their ideas about appropriate behavior, and we feel what they feel. Acts of charity are no exception, they will spread like air.
Read more about the science of spreading good.
Sources:
http://www.dailygood.org/view.php?sid=201
http://www.yogajournal.com/basics/898?page=5