1 and 1/2 min. Got the most popular letter and rest became apparent. Author’s name confirmed quote.
Histograms aren’t reliable with short quotes and I didn’t find assigning the most common letter, N, to the most common letter in written English particularly helpful. Nothing really suggested itself to me. This kind of quote can be difficult, BUT I found it surprisingly easy once I correctly guessed DGJ from context.
The frequency of the first four letters is:
N 7
J 6
H 5
Z 5
There isn’t enough dispersion to make reliable inferences.