1. He who learns but does not think is lost; he who thinks but does not learn is in danger. 　学而不思则罔，思而不学则殆。 2. When I walk along with two others, I may be able to learn from them. 三人行，必有我师。 3. What you know, you know; what you don’t know, you don’t know. 　 知之为知之，不知为不知。 4. Learn the new while reviewing the old. 　 温故而知新。 5. Isn’t it a pleasure that friends come to see you from far away? 有朋自远方来，不亦乐乎？ 6. Do not do to others what you would not have them do to you. 　 己所不欲，勿施于人。