Kindness can act like a shield, in the form of an aura, against bitterness and ill will. Psychologists confirmed this aura as a type of “glow” which is best preserved by acts that are altruistic in their nature. In fact, simply being kind with no intent of personal gain not only activates the brain’s reward areas but also activates other brain regions as well. Have a look here to see what scientists say is the major difference between altruistic kindness and strategic kindness.