“America was, until this last generation, a white country designed for ourselves and our posterity. It is our creation, it is our inheritance, and it belongs to us.”

Knox on the Declaration of Independence. Reported in David McCullough, 1776 (2005), p. 83.

In a debate in the Irish House of Commons on the vote of a grant which was recommended by Sir John Parnell, Chancellor of the Exchequer, as one not likely to be felt burdensome for many years to come, it was observed in reply that the House had no right to load posterity with a debt for what could in no degree operate to their advantage. This quotation was Sir Boyle's response.
[Barrington, Jonah, Personal sketches and recollections of his own times, Chapter XVII https://archive.org/details/personalsketche06barrgoog]

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.

Stenberg v. Carhart (2000) (dissenting).
2000s

citation needed

Source: Address given Assuming the Office / at the Saeima, https://www.president.lv/en/article/address-he-president-latvia-mr-egils-levits-assuming-office-saeima

2013, Second Inaugural Address (January 2013)
Context: We, the people, still believe that our obligations as Americans are not just to ourselves, but to all posterity.  We will respond to the threat of climate change, knowing that the failure to do so would betray our children and future generations. Some may still deny the overwhelming judgment of science, but none can avoid the devastating impact of raging fires and crippling drought and more powerful storms. The path towards sustainable energy sources will be long and sometimes difficult. But America cannot resist this transition, we must lead it. We cannot cede to other nations the technology that will power new jobs and new industries, we must claim its promise. That’s how we will maintain our economic vitality and our national treasure -- our forests and waterways, our crop lands and snow-capped peaks. That is how we will preserve our planet, commanded to our care by God. That’s what will lend meaning to the creed our fathers once declared.

Source: Address given Assuming the Office / at the Saeima, https://www.president.lv/en/article/address-he-president-latvia-mr-egils-levits-assuming-office-saeima

1984 Republican National Convention in Dallas. Full transcript http://www.cnn.com/ALLPOLITICS/1996/conventions/san.diego/facts/GOP.speeches.past/84.kirkpatrick.shtml