There is a nice story of rabbi Kook. I thing he is right:
Rabbi Kook teaches that peace starts at home. A story is told of a man who sets off to fix all the world´s problems and to bring peace to mankind. Everywhere he journeys, he meets with the leaders of quarreling nations, but fails in all of his attempts to persuade them to lay down their arms. Frustrated, he returns to his city and sets about making peace amongst all of the quarreling factions and groups. But just as before, he fails dismally in his efforts to influence the people he meets. Frustrated, he returns home, where he tries to make peace with his wife and children, who are angry at him for having left them to attend to the ills of the world. Here too, with his own family, he fails. Finally, having failed in everything he set out to achieve, he begins an inner journey to bring peace to himself. At last, he succeeds! Now when he tries to bring harmony into his home, his wife and children listen. The people in the city respect him and listen to his words. Recognized as a man of peace, he sets out again to bring peace to the world, and at this time the world is willing. All because he first achieved peace with himself.