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.

Try to learn something about everything and everything about something.  

科学不仅是理性的门徒，也是浪漫和激情的追随者。

喜欢你工作的人非常重要，否则生活和你的工作将会相当痛苦。