子绝四：毋意，毋必，毋固，毋我。
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 goal of mathematics is not to solve problems, but to understand them.
质量不是承诺；它是一种结果。
The artist must suffer to create, for creation is born of pain.
量子世界和经典世界之间的界限并不像我们曾经认为的那样清晰。