“...the major objective of Brazilian society is the strengthening of peace. We believe that the ideological conflict between West and East cannot and should not be solved militarily, because if in a nuclear war we saved our lives, we would not be able to save, whether we won or were won, our reason for living.”

Harvard University address (1978)
Context: Even if we are spared destruction by war, our lives will have to change if we want to save life from self-destruction. We cannot avoid revising the fundamental definitions of human life and human society. Is it true that man is above everything? Is there no Superior Spirit above him? Is it right that man's life and society's activities have to be determined by material expansion in the first place? Is it permissible to promote such expansion to the detriment of our spiritual integrity?
If the world has not come to its end, it has approached a major turn in history, equal in importance to the turn from the Middle Ages to the Renaissance. It will exact from us a spiritual upsurge, we shall have to rise to a new height of vision, to a new level of life where our physical nature will not be cursed as in the Middle Ages, but, even more importantly, our spiritual being will not be trampled upon as in the Modern era.
This ascension will be similar to climbing onto the next anthropologic stage. No one on earth has any other way left but — upward.

USENET posting to rec.sf.arts.fandom http://groups.google.com/group/rec.arts.sf.fandom/browse_frm/thread/303b0da0ab25aee/b12adceacd343279 28 September 2000, in the discussion of Robert A. Heinlein's quote "The cowards never started and the weaklings died on the way." (Expanded Universe, How to be a Survivor in the Atomic Age)
Other sources

1930s, Address at the Dedication of the Memorial on the Gettysburg Battlefield (1938)
Context: To the hurt of those who came after him, Lincoln's plea was long denied. A generation passed before the new unity became accepted fact. In later years new needs arose, and with them new tasks, worldwide in their perplexities, their bitterness and their modes of strife. Here in our land we give thanks that, avoiding war, we seek our ends through the peaceful processes of popular government under the Constitution. It is another conflict, a conflict as fundamental as Lincoln's, fought not with glint of steel, but with appeals to reason and justice on a thousand fronts — seeking to save for our common country opportunity and security for citizens in a free society. We are near to winning this battle. In its winning and through the years may we live by the wisdom and the humanity of the heart of Abraham Lincoln.

Canadian Memorial (2).
Epitaphs of the War (1914-1918) (1918)

"The Power of One", TIME Magazine (26 August 2002) http://content.time.com/time/magazine/article/0,9171,1003125,00.html

The Saviors of God (1923)
Context: God is imperiled. He is not almighty, that we may cross our hands, waiting for certain victory. He is not all-holy, that we may wait trustingly for him to pity and to save us.
Within the province of our ephemeral flesh all of God is imperiled. He cannot be saved unless we save him with our own struggles; nor can we be saved unless he is saved.
We are one. From the blind worm in the depths of the ocean to the endless arena of the Galaxy, only one person struggles and is imperiled: You. And within your small and earthen breast only one thing struggles and is imperiled: the Universe.

Source: What America Means to Me (1943), p. 183

About Adolf Eichmann's devotion. Quoted in "And the Crooked Shall be Made Straight" - Page 37 - by Jacob Robinson - Jews - 1965