What leads up to Klemperer's change in purpose and tone in his diary, I Will Bear Witness: A Diary of the Nazi Years, 1933-1941?

Klemperer began incorporating a record of the effects of
Hitler's regime into his life-long habit of diary writing from the beginning of Hitler's
entrance to power. Klemperer noted the changes that first began to appear at the edges
of life, the small things. His record starts with the ways in which Jews were first
forbidden to use telephones or keep pets and expands as the restrictions expanded to
being unable to buy eggs, meat, vegetable, or bread. He records the added impact made by
the yellow Jewish Star of David--which all Jews were forced to wear--into these daily
encroachments into Jewish humanity and life. Not only were Jews not allowed to buy food
or take a walk in the park, they were very publicly not allowed to these
things.

href="http://www.columbia.edu/cu/record/archives/vol26/vol26_iss15/2615_Klemperer_Nazi_Testimony.html">Klemperer
wrote his diary at great personal peril. It was a crime to keep a diary under Hitler's
rule. Klemperer's home was repeatedly raided and destructive searches repeatedly made.
Had it been found, the sentence for the crime would have been execution. As time went on
and the Hitler regime went from horrible to increasingly atrocious, Klemperer realized
his diaries were part of a greater purpose, a chronicle of an event larger than his
local experience. He wrote: "This is my heroics. I want to bear witness, precise
witness, until the very end." It is when he saw this grand scale that the purpose and
tone of his diary inevitably underwent a change.