The greatest obstacle to progress is not ignorance, but the illusion of knowledge.
城市的穷人就像树的根:看不见,但对生存至关重要。
纵欲之心正炽烈时,一想到将会卧病痛苦,兴致如寒冰;逐利之心正浓烈时,一想到将会命丧黄泉,味道如同嚼蜡。
The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.