The wise and virtuous man is at all times willing that his own private interest should be sacrificed to the public interest of his own particular order or society.
 Adam Smith, The Theory of Moral Sentiments (1759). copy citation

Context

“nor, in a wise and virtuous man, can all the sorrow of the most afflicting adversity ever dry up the joy which necessarily springs from the habitual and thorough conviction of the truth of the contrary system. The wise and virtuous man is at all times willing that his own private interest should be sacrificed to the public interest of his own particular order or society. He is at all times willing, too, that the interest of this order or society should be sacrificed to the greater interest of the state or sovereignty, of which it is only a subordinate part. He should, therefore, be equally willing that all those inferior interests should be sacrificed to the greater interest of the universe, to the interest of that great society of all sensible and intelligent beings, of which God himself is the immediate administrator and director.” source