But if we attempt to trace his error in exact terms, we shall not find it quite so easy as we had supposed.

Perhaps the nearest we can get to expressing it is to say this: that his mind moves in a perfect but narrow circle.

A small circle is quite as infinite as a large circle; but, though it is quite as infinite, it is not so large.

In the same way the insane explanation is quite as complete as the sane one, but it is not so large.

A bullet is quite as round as the world, but it is not the world.