Sorrow and happiness are the heresies of virtue; joy and anger lead astray from TAO; love and hate cause loss of virtue. The heart unconscious of sorrow and happiness - that is perfect virtue. One, without change - that is perfect repose. Without any obstruction - that is the perfection of the unconditioned. Holding no relations with the external world, - that is perfection of the negative state. Without blemish of any kind, - that is the perfection of purity.
ZhuangziPeople value that part of knowledge which is known. They do not know how to avail themselves of the Unknown in order to reach knowledge. Is this not misguided?
ZhuangziBut you now, you wear your soul on your sleeve, exhausting your energy, propping yourself up on a tree, mumbling, or bent over your desk, asleep. Heaven gives you a form and you wear it out by pointless argument.
ZhuangziWe 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.
Zhuangzi