“There are two types of laws: just and unjust. I would be the first to advocate obeying just laws. One has not only a legal but a moral responsibility to obey just laws. Conversely, one has a moral responsibility to disobey unjust laws”. In his 1963 Letter from Birmingham Jail, Dr. Martin Luther King stated his strategy of non-violent resistance, adding to a debate about the moral implications of defying authority.
The answer is 'his hair turns grayer' - that is the physical change which took place in the spirit of Christmas present from when he first appears in the story to when he leaves.
