The political liberty of the subject is a tranquility of mind arising from the opinion each person has of his safety.
物理学的美在于它能够用简单而优雅的理论解释复杂的事物。
The challenge in theoretical computer science is not just to solve problems, but to understand the nature of problem-solving itself.
对意识的研究必须摆脱一切形而上学的影响。