Generally speaking, envy, resentment, and self-pity are disastrous modes of thoughts.Self-pity gets fairly close to paranoia, and paranoia is one of the very hardest things to reverse.

如果没有了解植物生长规律的农民，最先进的温室也毫无价值。

接受自己的不足只会让你成为赢家。

I never guess. It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts.

发散级数是魔鬼的发明，基于它们的任何证明都是一种耻辱。