It is customary for adults to forget how hard and dull and long school is. The learning by memory of all the basic things one must know is a most incredible and ending effort. Learning to read is probably the most difficult and revolutionary thing that happens to the human brain and if you don’t believe that, watch an illiterate adult try to do it. (给你看大师如何举例子)School is not easy and it is not for the most part very much fun, but then, if you are very lucky, you may find a real teacher. Three real teachers in a lifetime is the very best of my luck. My first was a science and math teacher in high school, my second, a professor of creative writing at Stanford, and my third was my friend and partner, Ed Ricketts. (开门见山说清楚，作者所遇到的好老师都是谁)

　　I have come to believe that a great teacher is a great artist and that there are as few as there are any other great artists. It might even be the greatest of the arts since the medium is the human mind and spirit.

　　My three had these things in common: they all loved what they were doing. They did not tell, they catalyzed a burning desire to know. Under their influence, the horizons sprung wide and fear went away and the unknown became knowable. But most important of all, the truth, that dangerous stuff, became beautiful and precious.