This paper examines the major philosophical differences between Plato and Aristotle, two foundational thinkers of Western philosophy. It explores their contrasting views on the soul and its composition, cardinal virtues and harmony, the nature of ideas, the concept of God, and the ultimate human function. While Plato emphasizes harmony among the soul's three parts — reason, spirit, and appetite — and links justice to virtue within a community, Aristotle connects the soul inseparably to the body and argues that happiness, achieved through the exercise of reason, is humanity's highest good. The paper concludes that both systems offer valuable insights even as standards of happiness and morality evolve.
Plato and Aristotle are among the philosophers who played a fundamental part in shaping modern thought in Western society. The purpose of this paper is to analyze the differences between the two thinking systems belonging to these philosophers, examining the main ideas that each considered most important.
The concept of harmony was extremely important for Plato. He applied it to both the universe and the individual, arguing that the human soul can be healthy only if it reaches the ideal state of harmony. The matter is complicated by the soul being composed of three parts: spirit, reason, and appetite. Since these correspond to different needs and desires, the consequence is that when people face an important decision, a conflict arises among these components.
The most important and most difficult conflict is the one between duty and pleasure — in other words, between what someone has to do and what that person would actually like to do. Reason, grounded in an objective understanding of the surrounding world, tells people it is better to follow the just path. Appetite, on the other hand, focuses on pleasure and will most likely recommend the path that procures the most pleasure, ignoring the counsel of reason.
The situation becomes even more complex when the third part — spirit — is considered, as it is concerned mainly with honour. One might argue that it would be easier to choose one of these elements and follow it as a guide for behavior. It is, nevertheless, obvious that harmony cannot be reached in this manner.
Another important concept in Plato's philosophy is represented by the cardinal virtues: wisdom, temperance, courage, and justice. Possessing these virtues ought to be the life ideal of every person, and each virtue naturally corresponds to one of the three parts of the soul.
Temperance, for example, can serve as a weapon against appetite, guiding a person toward balance rather than excess. Courage is a tool people can use to defeat their fears and thereby reach wisdom. Wisdom is attained when the soul is in perfect balance and has reached perfect health — a state understood as one of justice.
It can therefore be stated that Plato finds a close correspondence between justice and harmony. The ethical dimension of harmony suggests that it is a person's moral duty to reach this state — in other words, to control self-destructive passion and succeed in realizing one's full potential.
Aristotle's view of the soul was markedly different. The central difference lay in the close, inseparable connection between the soul and the body. According to this philosopher, anything that harms the body will also harm the soul, and vice versa. This perfect symbiosis leads to two conclusions.
"Body-soul unity and three soul types"
"Ideal forms, God, goodness, and perception"
"Reason, happiness, virtue, and community"
There are many differences one could discuss when analyzing the philosophical systems of Plato and Aristotle. However, the goal is not to determine which of them was right or whose philosophy is superior. If happiness is our ultimate goal, we may be tempted to favor one system, but we must bear in mind that society changes, and the standards regarding both happiness and morality change with it. Under these circumstances, one can do nothing else but acknowledge the merits of both Plato and Aristotle.
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