Four types of people
Category 1: They know what they know. (These are excellent people because they can effectively use their ability in their respective field).
Category 2: They know what they don't know. (These are good people because they will develop themselves).
Category 3: They don't know what they know. (These are bad people because they can never use their abilities)
Category 4: They don't know what they don't know. (These are worst people because they can never develop themselves. They always feel pride in spite of their inability.)
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