What did Abraham Lincoln say was the best way for the living to honor the dead at Gettysburg?

Abraham Lincoln's birthday is a State Holiday in seven states. He has many statues and other memorials erected in his honor, such as the Lincoln Memorial in Washington DC. Many institutions and places are named after him, such as Lincoln NE. In honor of the 100th anniversary of his birth, his likeness was put on the U.S. penny. A rendering of Lincoln is also on the $5 bill. He is one of the four U.S. Presidents memorialized on Mt. Rushmore.