We are all in the gutter, but some of us are looking at the stars.

【译文】人活一辈子，就像花草树木繁荣，一春一秋，非常短暂。年少时不知道勤学苦读，弹指间就会变成白发老翁。月亮过了十五后光明就会越来越少，人到中年还一事无成，也就不会有大的作为了。

The principles of learning are universal across species.

预测未来的最好方法就是创造未来。

The most important thing in science is not to stop questioning.

What's terrible is to pretend that second-rate is first-rate. To pretend that you don't need love when you do; or you like your work when you know quite well you're capable of better.

解释：死亡、生存、惊恐、惧怕等观念都进入不到他的内心中，因而遇到任何事情都不害怕。