"It is enough to have a confidant in life. In this life, we should treat him with the same heart." These are the words given to Qu Qiubai. It's not good to pretend, but it's not good to be honest everywhere. It depends on the time. When talking to friends, you don’t need to pay attention, but when facing the enemy, you must always be on guard. When we are with friends, we can take off our clothes, but we must wear armor when going into battle. Friendship is two hearts treating each other sincerely, rather than one heart beating another heart. ——Lu Xun The best way to maintain friendship is not to do anything to him, and not to lend him money. ——Lu Xun