- via The Autocrat of the Breakfast‐table: Every Man His Own Boswell (Chapter XI, page 266). by Oliver Wendell Holmes, Sr. United Kingdom, Low, Marston, Searle & Rivington, 1891.
- Wikipedia: Oliver Wendell Holmes, Sr.
- also, Man’s mind, stretched to a new idea, never goes back to its original dimension. –Oliver Wendell Holmes. From the series Great Ideas by Ivan Chermayeff