An archer competing for a clay vessel shoots effortlessly, his or her skill and concentration unimpeded. If the prize is changed to a brass ornament, the hands begin to shake. If it is changed to gold, he or she squints as if going blind. The abilities do not deteriorate, but belief in them does, as he or she allows the supposed value of an external reward to cloud the vision.
ZhuangziThere is a beginning. There is no beginning of that beginning ... There is something. There is nothing.
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.
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