What was the purpose of this section of lincoln's gettysburg address?

You didn't show the section, but I'll offer this:  Lincoln's purpose in the Gettysburg Address was to urge everyone to honor those who had died at Gettysburg by striving to maintain the kind of nation imagined by America's founders.

President Lincoln delivered the Gettysburg Address on November 19, 1863.   in the Gettysburg Address, Lincoln affirmed the principle stated by the Declaration of Independence, that all men are created equal.  The massive number of casualties at the Battle of Gettysburg  gave impetus to Lincoln's words about preserving the Union and government of the people, by the people and for the people, but those ideas had been central to Lincoln's worldview before Gettysburg.  

His closing words of the speech are powerful:  

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