In no form of human productivity of far-reaching importance is the direct practical utility of every step in the process visible to the man who takes it.

在具有深远意义的人类生产力中，没有一种形式的过程中每一步的直接实用性对采取它的人来说是可见的。

In the vast number of actions where the direct utility of each step cannot be seen, he must act on general principles, on a conviction that the particular step is part of a long process which leads forward to the end.

在看不到每个步骤的直接效用的大量行动中， 他必须按照一般原则行事， 坚信特定步骤是导致终点的漫长过程的一部分。