The end of history will be a very sad time. The struggle for recognition, the willingness to risk one's life for a purely abstract goal, the worldwide ideological struggle that called forth daring, courage, imagination, and idealism, will be replaced by economic calculation, the endless solving of technical problems, environmental concerns, and the satisfaction of sophisticated consumer demands.

Loneliness is the curse of nature to those who live in groups, and solitude is the only way out of loneliness.

The primary rules of obligation are those that require or forbid certain actions.

解读：人际关系需要持续投入情感、关怀来维系，只想索取不愿付出，关系迟早破裂，提醒日常用心经营人脉，多给予温暖。

There is no greater sorrow than to recall happiness in times of misery.