Apparently, quoting Abraham Lincoln is a popular pastime. So popular, in fact, that the Illinois Historic Preservation Agency put together a page of quotations attributed to Lincoln, letting you know whether he actually said such things as "To sin by silence, when they should protest, makes cowards of men" (he didn't). Also available: examples of facsimiles of Lincoln documents, so you can compare them to the copy of the Gettysbug Address that you've got lying in your junk drawer, to see if it's real or not.