Read Paragraphs 13-17 ("So let us begin anew . . . " and the four paragraphs that follow). So let us begin anew -- remembering on both sides that civility is not a sign of weakness, and sincerity is always subject to proof. Let us never negotiate out of fear, but let us never fear to negotiate.

Let both sides explore what problems unite us instead of belaboring those problems which divide us.

Let both sides, for the first time, formulate serious and precise proposals for the inspection and control of arms, and bring the absolute power to destroy other nations under the absolute control of all nations.

Let both sides seek to invoke the wonders of science instead of its terrors. Together let us explore the stars, conquer the deserts, eradicate disease, tap the ocean depths, and encourage the arts and commerce.

Let both sides unite to heed, in all corners of the earth, the command of Isaiah -- to "undo the heavy burdens, and [to] let the oppressed go free."

And, if a beachhead of cooperation may push back the jungle of suspicion, let both sides join in creating a new endeavor -- not a new balance of power, but a new world of law -- where the strong are just, and the weak secure, and the peace preserved.

…

In the long history of the world, only a few generations have been granted the role of defending freedom in its hour of maximum danger. I do not shrink from this responsibility -- I welcome it. I do not believe that any of us would exchange places with any other people or any other generation. The energy, the faith, the devotion which we bring to this endeavor will light our country and all who serve it. And the glow from that fire can truly light the world.

And so, my fellow Americans, ask not what your country can do for you; ask what you can do for your country.

My fellow citizens of the world, ask not what America will do for you, but what together we can do for the freedom of man.

Finally, whether you are citizens of America or citizens of the world, ask of us here the same high standards of strength and sacrifice which we ask of you. With a good conscience our only sure reward, with history the final judge of our deeds, let us go forth to lead the land we love, asking His blessing and His help, but knowing that here on earth God's work must truly be our own.

How do these paragraphs refine the claim that nations must work together to achieve world peace?

They explain what each side has done to prevent peace and why the current situation needs to change.

They provide moral arguments against conflict and present emotional appeals to work for peace.

They describe current barriers to peace and suggest possible solutions.

They list sources of conflict and warn of the potential negative consequences of war.