Each part must function in moderation to contribute to the health of the whole. Desire must be inferior to reason, or else it will throw the individual out of balance and lead him into injustice and unhappiness. Emotion can also master desire with the alliance of reason. This alliance according to Socrates is similar to the rulers and guardians of the state. Therefore, the individual is a sort of miniature state, and justice in the soul is like justice in the state. On the contrary, the situation of the unjust, whether state or individual, desires hold a tyranny. Because of a lack of internal control, outside things move the unjust person/state around at will. The unjust ends up living a life of fear and anxiety, the essence of being out of control. Socrates states that only the man of reason has pure pleasures. All others have varying degrees of unhappiness. By equating the philosopher with the man of pure reason, he sets up a situation where proof is not so much necessary for any of his points as it is to say that the philosopher, the only one who sees clearly, says so.? It is these men, the philosophers, who best understood the harmony of all parts of the universe were closest to God and that only they were capable of creating a harmonious and just society. These philosophers, he believed, would agree and get along with each other with equal harmony rather than break into hostile faction.
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?Until philosophers are kings, or the kings and princes of this world have the spirit and power of philosophy, and political greatness and wisdom meet in one, and those commoner natures who pursue either to the exclusion of the other are compelled to stand aside, cities will never have rest from their evils- nor the human race as I believe, - and then only will this our State have a possibility of life and behold the light of day.? .
Socrates and Plato also believed that man was not self-sufficient, they believed man would be most happy living in a State.