You may fool all the people some of the time; you can even fool some of the people all the time; but you can't fool all of the people all the time.
Alexander K. McClure Lincoln's Yarns and Stories (1904) - also sometimes attributed to Phineas Barnum.
Let us have faith that right makes might, and in that faith, let us, to the end, dare to do our duty as we understand it.
Speech, 27 February 1860, in R. P. Basler (ed.) Collected Works… (1953)
'A house divided against itself cannot stand.' I believe this government cannot endure permanently, half slave and half free.
Speech, 16 June 1858, in R. P. Basler (ed.) Collected Works… (1953)
In giving freedom to the slave, we assure freedom to the free - honourable alike in what we give and what we preserve. We shall nobly save, or meanly lose, the last, best hope of earth.
Annual Message to Congress, 1 December 1862, in R. P. Basler (ed.) Collected Works… (1953)...and finally, the last words of Abraham Lincoln:
She won't think anything about it.
Response to his wife's question asking what the women sitting next to them in the box at Ford's Theatre would think about them holding hands, on 16th April 1865.