多年在校学习，使Goethe养成了对书面文字的信任超过自己直觉的习惯，这位年轻的医学生在第一年临床实习前面临一个问题——他曾准确描述为‘最困难的’是：他必须学会如何观察。  

Accustomed during the school years to place greater trust in the written word than in his own senses, the   young medical student in his first pre-clinical term is faced with a problem which Goethe aptly describes as “hardest of all”: He has to learn how to see.  

  “What is hardest of all? That which seems most simple: to see with your eyes what is before your eyes.”  

牛顿的力学理论取得了巨大的成功，他还在世时就已经成了名人，使得罗马教皇亚历山大宣称：

自然和自然界的定律将其置于黑夜，

神说，要有牛顿！就有了光。 

In the beginning God created the heaven and the earth. And the earth was without form, and void; and darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters. And God said, Let there be light: and there was light.  

霍金说：  

T = hc^3 / 8GMk  

于是黑洞发出光来。