Whenever you make a donation of time or labor, or do something out of altruistic intention, take a moment to think, "I am doing this out of altruistic intention. Having this intention makes me so happy."
Whenever you meet or bring to mind an admirable, inspiring person, take a moment to think, "There exists this wonderful person in this world. I'm so happy."
Whenever you see somebody performing an altruistic or heroic act, take a moment to think, "More good is being done in this world. I'm so happy."
— Chade-Meng Tan in Joy on Demand