From www.psychologicalscience.org - March 14, 2012 5:00 PM

It’s normal to not always act on your sense of compassion—for example, by walking past a beggar on the street without giving them any money. Maybe you want to save your money or avoid engaging with a homeless person. But even if suppressing compassion avoids these costs, it may carry a personal cost of its own, according to a new study published in Psychological Science, a journal of the Association for Psychological Science. After people suppress compassionate feelings, an experiment shows, they lose a bit of their commitment to morality.