Is there a word box for these?
The best answer for this question would be:
Passionate
emotion
The lines represent how passionate a person’s emotion can be
when they are chasing for the ideal of justice, it reflects how Romanticism
defines another form of passion through the poem.
Because back then they believe that if they didn't see it then it is not there or created for example when the french believe that the earth is flat but we know now that it is round.
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.