We cling to our own point of view, as though everything depended on it. Yet our opinions have no permanence; like autumn and winter, they gradually pass away.
ZhuangziThose that think that wealth is the proper thing for them cannot give up their revenues; those that seek distinction cannot give up the thought of fame; those that cleave to power cannot give the handle of it to others. While they hold their grasp of those things, they are afraid of losing them. When they let them go, they are grieved and they will not look at a single example, from which they might perceive the folly of their restless pursuits - such men are under the doom of heaven.
ZhuangziStandards are different for all things, so the standard set by man is by no means the only 'certain' standard. If you mistake what is relative for something certain, you have strayed far from the ultimate truth.
ZhuangziThe birth of a man is the birth of his sorrow. The longer he lives, the more stupid he becomes, because his anxiety to avoid unavoidable death becomes more and more acute. What bitterness! He lives for what is always out of reach! His thirst for survival in the future makes him incapable of living in the present.
Zhuangzi