A strict psychological egoist would argue that it is not possible for human beings to be motivated by anything other than self-interest.

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A strict psychological egoist maintains that all human actions are motivated by self-interest alone. They argue that even seemingly altruistic actions, such as helping others or making sacrifices, ultimately stem from a desire for personal gain or satisfaction. Therefore, according to their belief, it is not possible for humans to be motivated by anything other than self-interest.

A Strict Psychological Egoist Would Argue That It Is Not