数学中最重要的是理解概念,而不仅仅是记忆公式。
你应该避免懒惰和不可靠。
最大的风险是不冒任何风险。
The question is not whether the thing exists, but whether it has any essence which is capable of existence without us.
To live is the rarest thing in the world. Most people exist, that is all.