Public and Priviate Virtue

John Adams writing to Mercy Warren:

The Form of Government, which you admire, when its Principles are pure is admirable, indeed, it is productive of every Thing, which is great and excellent among Men. But its Principles are as easily destroyed, as human Nature is corrupted. Such a Government is only to be supported by pure Religion or Austere Morals. Public Virtue cannot exist in a Nation without private, and public Virtue is the only Foundation of Republics. There must be a positive 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.