Understanding Egoism in the Context of Philosophy

In philosophy, egoism is the theory that one’s self is, or should be, the motivation and the goal of one’s own action. Egoism has two variants, descriptive or normative. The descriptive (or positive) variant conceives egoism as a factual description of human affairs. That is, people are motivated by their own interests and desires, and they cannot be described otherwise. The normative variant proposes that people should be so motivated, regardless of what presently motivates their behavior. Altruism is the opposite of egoism. The term “egoism” derives from “ego,” the Latin term for “I” in English. Egoism should be distinguished from egotism, which means a psychological overvaluation of one’s own importance, or of one’s own activities.
People act for many reasons; but for whom, or what, do or should they act—for themselves, for God, or for the good of the planet? Can an individual ever act only according to her own interests without regard for others’ interests? Conversely, can an individual ever truly act for others in complete disregard for her own interests? The answers will depend on an account of free will. Some philosophers argue that an individual has no choice in these matters, claiming that a person’s acts are determined by prior events which make illusory any belief in choice. Nevertheless, if an element of choice is permitted against the great causal impetus from nature, or God, it follows that a person possesses some control over her next action, and, that, therefore, one may inquire as to whether the individual does, or, should choose a self-or-other-oriented action. Morally speaking, one can ask whether the individual should pursue her own interests, or, whether she should reject self-interest and pursue others’ interest instead: to what extent are other-regarding acts morally praiseworthy compared to self-regarding acts?
In Leviathan, Hobbes maintains that, “No man giveth but with intention of good to himself; because gift is voluntary; and of all