Hi Eva. I believe another source for this quote is Edward Dicey (1832-1911), an English journalist who spent six months in the U.S. during the Civil War. Dicey was a special correspondent for two British magazines.
The "vices/virtues" quote is contained in his article entitled "Washington in the Civil War" MacMillan's Magazine, 6 (May, 1862), pp. 16-29.
But, like what you said, Lincoln was actually reporting what was originally said to him, not by him. So, at this point, I think the quote at Ford's seems misleading.