Compassion is not a switch we can turn off and on when it is convenient. Feeling something deep in our gut when we encounter hurting people is not as simple as deciding that this time we will care. Compassion is a muscle, and this muscle grows by being exercised. We become more compassionate by practicing compassion. We practice compassion by allowing ourselves to see and feel the pain of others. By refusing to choose numbness when we’re uncomfortable with hard truths. –Chris Field, A Billion Hours of Good: Changing the World 14 Minutes at a Time