“Our lives no longer belong to us alone; they belong to all those who need us desperately.”

The day I stood up alone

Source: The Wee Free Men

11 August 1972; p. 90
1970's, Conversations with Samuel Beckett and Bram van Velde (1970 - 1972)

Source: Hopscotch

As quoted in "Dutch cabinet intensifies security after Paris attacks" http://news.xinhuanet.com/english/2015-11/14/c_134816626.htm, Xinhua News Agency (14 November 2015)
2010s

Statement attributed to Vanzetti by Philip D. Stong, http://www.powys-lannion.net/Powys/America/S_V.htm a reporter for the North American Newspaper Alliance who visited Vanzetti in prison in May of 1927 shortly before he and Sacco were executed.
Context: If it had not been for these things, I might have lived out my life talking at street corners to scorning men. I might have died, unmarked, unknown, a failure. Now we are not a failure. This is our career and our triumph. Never in our full life could we hope to do such work for tolerance, for justice, for man's understanding of man as now we do by accident. Our words — our lives — our pains — nothing! The taking of our lives — lives of a good shoemaker and a poor fish-peddler — all! That last moment belongs to us — that agony is our triumph.

2013, Brandenburg Gate Speech (June 2013)
Context: The wall belongs to history. But we have history to make as well. And the heroes that came before us now call to us to live up to those highest ideals -- to care for the young people who can't find a job in our own countries, and the girls who aren't allowed to go to school overseas; to be vigilant in safeguarding our own freedoms, but also to extend a hand to those who are reaching for freedom abroad. This is the lesson of the ages. This is the spirit of Berlin. And the greatest tribute that we can pay to those who came before us is by carrying on their work to pursue peace and justice not only in our countries but for all mankind.

The Progress of Fifty Years (1893)
Context: Half a century ago women were at an infinite disadvantage in regard to their occupations. The idea that their sphere was at home, and only at home, was like a band of steel on society. But the spinning-wheel and the loom, which had given employment to women, had been superseded by machinery, and something else had to take their places. The taking care of the house and children, and the family sewing, and teaching the little summer school at a dollar per week, could not supply the needs nor fill the aspirations of women. But every departure from these conceded things was met with the cry, "You want to get out of your sphere," or, "To take women out of their sphere;" and that was to fly in the face of Providence, to unsex yourself in short, to be monstrous women, women who, while they orated in public, wanted men to rock the cradle and wash the dishes. We pleaded that whatever was fit to be done at all might with propriety be done by anybody who did it well; that the tools belonged to those who could use them; that the possession of a power presupposed a right to its use.

Source: Morning Star (2016), Ch. 1: Only the Dark