"Any problem in
Computer Science can be solved with another
level of indirection."
As per Wikiquote this famous remark has been attributed to the renowned Computer Scientist David Wheeler in
"Principles for Computer System Design." Turing Award Lecture given on February 17, 1993 by Butler Lampson.
Also see the blurb on Indirection in Wikipedia.
For actual examples of this principle being put to good use,
please refer to lecture viewgraphs on Design Principles
from Prof. Yin Zhang's web-page in CS Dept., Univ of Texas, Austin.
(it is one of the first few links that came up in a Google search on the string "Computer Science Principle of Indirection")