There is a broad house of life and there is a narrow house of life. What marks the broad house is not so much the breadth of the walls within which its people live nor the height of the deeds they do or of the passions they experience; rather it is the insulation—as it may be called—which protects their nerves against the agony of too rough contact. Custom is the larger part of this insulation. In the broad house men and women grow unconcerned about irritating things with which they are familiar. The minor imbecilities of their relatives and their companions do not pain them greatly. They do not tug at leashes or kick against pricks or cry over spilt milk or strain at gnats. They can live in the presence of their own thoughts without discomfort. And when custom is not enough to keep the insulation stout, change of scene or mood or occupation mends it. In the broad house memory is not very long. When the occupants begin to feel stifled they stir about and soon forget. When they begin to brood they expose themselves to laughter or excitement and pull themselves together. When they have been bored beyond a certain point they turn to a new job and get lost in it. From too much thinking they take refuge in sleep or liquor. In the narrow house things are different. Custom does less there, being an insulation which does not fit the sorer nerves. Instead, it rasps them. They wince and keep on wincing more and more at the burden and the pressure of mere existence. Lying so near the surface they suffer from the proximity of other nerves in other people and nearly as much from the proximity of other people without nerves. Men and women who are so tender first feel irritation at minor imbecilities, then pain, then anger, and may go on to madness. The contempt which familiarity breeds is in them an active passion—not, as in the broad house, a comfortable ease or even entertainment. Their memories are too long and too alive for that. Each scratch leaves a scar and the scar smarts for ever. Imagination sets in with the neurotic when he feels stifled or begins to brood or grows bored or finds himself deep in thought. It carries him, as the imagination can, beyond the actual occasion, calling up future or conjectural irritations or injuries and bringing them to wound the nerves, which are already twitching. Retreating from the unendurable frontiers of his experience he lives tautly at the centre, his scrutiny fixed inward. He may hate what he sees there or he may love it.