The special form of this activity in the public interest is also significant. The process of drawing a line round Jerusalem by enclosing it within the definite circuit of a wall helped to mark the individuality and unity of the place as a _city_, which an amorphous congerie of houses could not be, according to the ancient estimate, because the chief distinction between a city and a village was just this, that the city was walled while the village was unwalled. The first privilege enjoyed by the city would be its security--its strength to withstand assaults. But the walls that shut out foes shut in the citizens--a fact which seems to have been present to the mind of the poet who wrote,-- "Our feet are standing Within thy gates, O Jerusalem; Jerusalem, that art builded As a city that is compact together."[167] [167] Psalm cxxii. 2, 3. The city is "compact together." City life is corporate life. It is not at all easy for us to appreciate this fact while our idea of a city is only represented by a crowd of men, women, and children crammed into a limited space, but with scarcely any sense of common life and aims; still less when we look behind the garish splendour of the streets to the misery and degradation, the disease and famine and vice, that make their nests under the very shadow of wealth and pleasure. Naturally we turn with loathing from such sights, and long for the fresh, quiet country life. But this accidental conglomerate of bricks and human beings is in no sense a city. The true city--such a city as Jerusalem, or Athens, or Rome in its best days--is a focus of the very highest development of life known to man. The word "civilisation" should remind us that it is the city which indicates the difference between the cultivated man and the savage. Originally it was the _civis_, the citizen, who marched in the van of the world's progress. Nor is it difficult to account for his position. Intercommunication of ideas sharpening intelligence--"as iron sharpeneth iron,"--division of labour permitting the specialisation of industry, combination in work making it possible for great undertakings to be carried out, the necessity for mutual considerateness among the members of a community and the consequent development of the social sympathies, all tend to progress. And the sense of a common life realised in this way has weighty moral issues. The larger the social unit becomes, the more will people be freed from pettiness of thought and selfishness of aim. The first step in this direction is made when we regard the family rather than the individual as the true unit. If we pass beyond this in modern times, we commonly advance straight on to the whole nation for our notion of a compact community. But the stride is too great. Very few people are able to reach the patriotism that sinks self in the larger life of a nation. With a Mazzini, and even with smaller men who are magnetised by the passion of such an enthusiast in times of