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Socrates worked on criticizing the common foundation of beliefs at his time. One of his greatest paradoxes was the weakness of will-doing wrong when you know what is right. But in the end according to Socrates, he believed that a person will only commit moral evil if he lacks moral knowledge.
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Plato tried to change the people's way of thinking of what happiness meant in their lives. His point was that we could only be happy when we are virtuous.
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His philosophy was bounded with action conductive to man's good. He believed that virtue is something we acquire that regulate our emotions.