出自春秋·鲁·孔子《论语》。孔子杜绝了四种弊病，不妄意，不妄下决断，不固执，不以自我为中心。
The best time to plant a tree was 20 years ago. The second best time is now.
The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.
The great question which, in all ages, has disturbed mankind, and brought on them the greatest part of their mischiefs, has been, not whether there be power in the world, nor whence it came, but who should have it.
