source

[http://books.google.com/books?id=2iwmAQAAMAAJ&q=%22There+are+many+people+who+reach+their+conclusions+about+life+like+schoolboys+they+cheat+their+master+by+copying+the+answer+out+of+a+book+without+having+worked+out+the+sum+for+themselves%22&pg=PA53#v=onep