The term "pathological altruism" was popularised by the book "Pathological Altruism". Proposed explanations for altruistic behavior include biological altruism and reciprocal altruism. Druze principles focus on honesty, loyalty, filial piety, altruism, patriotic sacrifice, and monotheism. Developing compassion, altruism, and other humane virtues is following of the Way. Singer discusses the relationship between biological capacity for altruism and morality. His embrace of egotism is in stark contrast to Godwin's altruism. Humanity is a virtue associated with basic ethics of altruism derived from the human condition. This can be altruism towards humanity that leads to altruism towards the creator or God. These behaviours may be examples of altruism. This is similar to reciprocal altruism in biology. Much debate exists as to whether ""true"" altruism is possible in human psychology. Other theories followed, some derived from game theory, such as reciprocal altruism. This strategy is one type of reciprocal altruism. Inclusive fitness theory resolved the issue of how altruism can evolve. Surveys suggest a strong link between faith and altruism.