The world that America seeks is not one we can build on our own. For human rights to reach those who suffer the boot of oppression, we need your voices to speak out. In particular, I appeal to those nations who emerged from tyranny and inspired the world in the second half of the last century, from South Africa to South Asia, from Eastern Europe to South America. Don't stand idly by, don't be silent when dissidents elsewhere are imprisoned and protesters are beaten. Recall your own history, because part of the price of our own freedom is standing up for the freedom of others.

"Remarks to the United Nations General Assembly in New York City," September 23, 2010. Online by Gerhard Peters and John T. Woolley, The American Presidency Project

Barack Obama: Remarks to the United Nations General Assembly in New York City[presidency.ucsb.edu]