It seems to me, reading Pericles' funeral oration (431 BC), that it clearly provided the inspiration for Abraham Lincoln's Gettysburg Address.
Pericles begins by dismissing his own speechmaking ability: "[I]t is hard to speak properly upon a subject where it is even difficult to convince your hearers that you are speaking the truth." That reminded me of Lincoln's "The world will little note, nor long remember what we say here."
Pericles then dwells on what we might call "Athenian exceptionalism": "Our constitution does not copy the laws of neighboring states; we are rather a pattern to others than imitators ourselves." A bit later, he adds, "In short, I would say that as a city we are the school of Hellas." This brought to mind Lincoln's beginning, "Four score and seven years ago our fathers brought forth, on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal. Now we are engaged in a great civil war, testing whether that nation, or any nation so conceived and so dedicated, can long endure."
Most striking of all, both speeches conclude by challenging the living to live up to the standard set by the fallen. "So dies these men as became Athenians," says Pericles. "You, their survivors, must determine to have as unaltering a resolution in the field." I think Lincoln expresses that thought better: "It is for us the living, rather, to be dedicated here to the unfinished work which they who fought here have thus far so nobly advanced. It is rather for us to be here dedicated to the great task remaining before us -- that from these honored dead we take increased devotion to that cause for which they here gave the last full measure of devotion -- that we here highly resolve that these dead shall not have died in vain -- that this nation, under God, shall have a new birth of freedom -- and that government of the people, by the people, for the people, shall not perish from the earth."
(After writing this I did some quick Googling and saw that the comparison between the two speeches is apparently a major theme of Garry Wills' book on the Gettysburg Address. So clearly I am not the first to come across this.) I knew that Lincoln was into Shakespeare and the King James Bible, but I hadn't realized he also absorbed the Greeks.