Page "God object" Paragraph 1

The basic idea behind object-oriented programming is that a big problem is broken down into several smaller problems ( a divide and conquer strategy ) and solutions are created for each of them.

Once the small problems have been solved, the big problem as a whole has been solved.

Therefore there is only one object about which an object needs to know everything: itself.

Likewise, there is only one set of problems an object needs to solve: its own.