Why is Plato concerned about the difference between mere belief and true knowledge, particularly concerning the issues of justice?

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The Answer is Plato says that the Sophists deal in mere belief (pistis) about justice and not in true knowledge(episteme). A true understanding of justice takes a long time to achieve; Sophists in courtrooms are only able to create beliefs about justice. Plato sees this as dangerous, as people operating only on beliefs about justice instead of true knowledge will commit injustices.

Why Is Plato Concerned About the Difference Between Mere Belief