Every book is a new journey. I never felt I was an expert on a subject as I embarked on a project.

Every book is a new journey. I never felt I was an expert on a subject as I embarked on a project.

每一本书都是一次新的旅程。当我开始一个项目时，我从来没有觉得自己是某一学科的专家。

-- David McCullough 戴维·麦卡洛