Which quotation from "The Gettysburg Address" most effectively develops the theme that it is important to honor those who have fallen in defense of our country's principles?

The quotation from The Gettysburg Adress that most effectively develops the theme that is important to honor those who have fallen in defense of our country's principles is: " 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 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".