无知
Inquiry into reality begins with the recognition of our ignorance.
Ignorance is the root and stem of all evil.
True wisdom is in knowing one's own ignorance.
The fear of death follows from the fear of life. A man who lives fully is prepared to die at any time.
The fountain of content must spring up in the mind, and they who have so little knowledge of human nature as to seek happiness by changing anything but their own dispositions will waste their lives in fruitless efforts.
A good world needs knowledge， kindliness， and courage； it does not need a regretful hankering after the past or a fettering of the free intelligence by the words uttered long ago by ignorant men.
Men are born ignorant， not stupid； they are made stupid by education.