If psychological egoism is true, then any altruistic moral theory asks us to do the impossible. True.
Psychological egoism suggests that all behaviors are motivated by self-interest. In other words, it suggests that every action or behavior or decision of every person is motivated by self interest. It also suggests that every action must be motivated by self interest.
Altruism is an ethical doctrine that holds that the moral value of an individual's actions depends solely on the impact on other individuals, regardless of the consequences on the individual him- or herself.
Egoism can be defined as extreme self-centeredness whereas altruism can be defined as selflessness. These two can be considered as two extremes of human quality. An egoistic person only cares for himself, but an altruistic person cares for others ignoring his own self.
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