Peace need not be impracticable, and war need not be inevitable. By defining our goal more clearly, by making it seem more manageable and less remote… - John F. Kennedy

I ask particularly that those of you who are now in school will prepare yourselves to bear the burden of leadership over the next 40 years here in the United States, and make sure that the United States — which I believe almost alone has maintained watch and ward for freedom — that the United States meet its responsibility. That is a wonderful challenge for us as a people.

If anyone is crazy enough to want to kill a president of the United States, he can do it. All he must be prepared to do is give his life for the president's.

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 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."