Motivation and emotion both push and pull people into action, thoughts, and feelings. The push comes from within the person as motives and the pull comes from the environment as incentives and goals. Emotions also push people from within to fulfill the aim of the emotion. Motivation resembles a journey toward an end-state that encompasses a goal object, consummating the goal, and experiencing the accompanying affect (feelings). People try to anticipate these end-states cognitively, behaviorally, and affectively. This latter idea emphasizes hedonism: pursuit of pleasure and avoidance of pain to be spread over the long-run. Internal sources and external sources combine to motivate behavior, such as the need to belong is satisfied by family. What motivates people has evolved through Darwin's concepts of variation and selection.