This is the whole weakness of certain schools of progress and moral evolution.

They suggest that there has been a slow movement towards morality, with an imperceptible ethical change in every year or at every instant.

There is only one great disadvantage in this theory.

It talks of a slow movement towards justice; but it does not permit a swift movement.

A man is not allowed to leap up and declare a certain state of things to be intrinsically intolerable.