Kindness

"I'm an evolutionary scientist who studies kindness as a strategy that can succeed or fail, depending upon the circumstances. When kind people lavish their kindness upon each other, life blooms. But kind people are vulnerable to exploitation by people who aren't kind. Conversely, selfishness and exploitation in all forms provide benefits for the individual, at least over the short term, no matter what the collateral damage to others and even everyone over the long term."

David Sloan Wilson