How does Dickens present Scrooge's redemption in stave 5 of A Christmas Carol?

Whatshows in stave 5 of is the
culmination and the manifestation
of Scrooge's redemption: the joyful "Merry
Christmas," the "prize turkey"
for the Cratchits, the charitable donation,
Bob Cratchit's raise. However, Scrooge's redemption
occurred gradually
(almost imperceptibly) throughout the preceding staves. The final stave

represents the ultimate result.

In stave 2, the Ghost of Christmas
Past takes
Scrooge to the boarding school that Scrooge attended as a
boy:

They went, the Ghost and Scrooge,
across the hall, to a door at the back of the house.
It opened before them,
and disclosed a long, bare, melancholy room, made barer still by lines of

plain deal forms and desks. At one of these a lonely boy was reading near a feeble fire;
and
Scrooge sat down upon a form, and wept to see his poor forgotten self as
he used to be. . .
.

Then, with a rapidity of transition
very foreign to his usual character,
he said, in pity for his former self,
"Poor boy!" and cried...