上句见：Day117
The Story of Philosophy的第118句：第1章Plato第2节II. Socrates第5段第3句：

There had been philosophers before him, of course: strong men like Thales and Heraclitus, subtle men like Parmenides and Zeno of Elea, seers like Pythagoras and Empedocles; but for the most part they had been physical philosophers; they had sought for the physics or nature of external things, the laws and constituents of the material and measurable world. That is very good, said Socrates; but there is an infinitely worthier subject for philosophers than all these trees and stones, and even all those stars; there is the mind of man. What is man, and what can he become?
浙江大学译本：究竟什么是人？他又将变成什么？

解析

这句话指研究人的心灵的具体内容：究竟什么是人？他又将变成什么？
1、 What is man,
什么是人？

2、and what can he become?
他将变成什么？

究竟人是什么？他又将变成什么？

整段

这段介绍哲学的两种研究主题：一种向外研究树呀石呀甚至星星等事物，一种向内研究人的心灵。在苏格拉底看来，后者远比前者有价值。

当然，在苏格拉底之前有过哲学家：有像泰勒斯和赫拉克利特那样强者，有像巴门尼德和埃利亚的芝诺那样的诡辩者，有像毕达哥拉斯和恩培多克勒那样预言者。但他们绝大多数是自然哲学家，都在追寻外部事物的物理特性和本质，即物质和可测量世界的法则及构成要素。“这个不错，”苏格拉底说，“但对于哲学家来说，有一个比所有这些树木、石头，甚至所有那些星星都要有价值得多的主题；那就是人的心灵。”究竟人是什么？他又将变成什么？