The standard process of organizing knowledge by departments, and sub-departments, and further breaking it up into separate courses, tends to conceal the homogeneity of knowledge, and at the same time to omit much that falls between the courses.

[…a] goal of this course is to reveal the essential unity of all knowledge rather than the fragments which appear as individual topics are taught. In your future anything and everything you know might be useful, but if you believe the problem is in one area, you are not apt to use information that is relevant but which occurred in another course.