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.”
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?”