"Many books require no thought from those who read them, and for a very simple reason; they made no such demand upon those who wrote them"

This quote by Charles Caleb Colton is a commentary on the quality of books that are offered to readers. He is suggesting that many books are not thought-provoking and require no effort from the reader because they were not written with any idea or effort. Colton is implying that the authors of these books did not put any effort into their writing, and as an outcome, the books are not stimulating or challenging for the reader. He is recommending that readers must be more selective in the books they choose to read, and need to try to find books that require idea and effort from the author. Colton is also suggesting that authors need to put more effort into their writing, so that readers can be challenged and promoted by the books they check out. Ultimately, Colton is encouraging readers and authors to be more critical in their options, so that readers can be rewarded with books that are thought-provoking and appealing.