The only way to learn mathematics is to do mathematics.
Quality is not a claim; it is a evidence.
The boundaries which divide Life from Death are at best shadowy and vague. Who shall say where the one ends, and where the other begins?
巫术并非源于对普遍力量的抽象概念,也不是错觉的结果;它是一种源于人类需求的制度。