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Confucius said, “There are three kinds of beneficial friends and three kinds of harmful friends. Friendship with the upright, friendship with the trustworthy, and friendship with the well-informed – these are beneficial. Friendship with the fawning, friendship with the insincerely agreeable, and friendship with the glibly eloquent – these are harmful.”
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The Master said, “If you truly love someone, can you refrain from making him work hard? If you are sincerely devoted to someone, can you avoid instructing him?”