however, fraternal love is not stable. being away for too a long time, losing all common benefits, friends will become estranged. once their interest has changed, they no longer understand each other, and even this would harm friendship. at all times and in all countries, many close friends and battle companions who once worked together and fought together became enemies in the end. quiet a few of the emperors in ancient china even killed those who had helped them found their dynasties. the taiping heavenly kingdom would not have failed if it hadn't been for the contending and massacring among the those who first rose in rebellion at the beginning of the uprising. what else we need to pay attention to is that some friends, after being away from each other for too long a time, have lost so much of their original characters that when meeting again, you will feel that you are still the same as you were, while they are no longer themselves. they may have the same feeling about you, so sometimes it's better not to meet each other again. as the chinese proverb goes “friendship can not last for three years and flowers can not stay in blossom for three months”.it's not so easy to maintain real friendship which needs mutual understanding, tolerance and sacrifice. any kinds of harsh treatment will damage friendship.