Public Virtue cannot exist in a Nation without private, and public Virtue is the only Foundation of Republics. There must be a possitive Passion for the public good, the public Interest, Honour, Power, and Glory, established in the Minds of the People, or there can be no Republican Government, nor any real Liberty. And this public Passion must be Superiour to all private Passions. Men must be ready, they must pride themselves, and be happy to sacrifice their private Pleasures, Passions, and Interests, nay their private Friendships and dearest Connections, when they Stand in Competition with the Rights of society.

John Adams (1735–1826) American lawyer, Founding Father, statesman, US President (1797–1801)

Letter (1776-04-16) to Mercy Otis Warren
    (Source)

Adams went on to express doubt whether an American nation could live up to such ideals.