Quigley was a brilliant historian. His application of scientific method and anthropological science to history remains unparalleled today. Most historians relate facts and events. Quigley looked for the underlying patterns, the drivers of human behavior and culture.
This, of course was quite at odds with modern prevailing historical wisdom, most of which is infected with the Marxist outlook - the denial of culture or individual conscience in the role of human affairs.
The first part of “Evolution” was terribly boring and dry but extremely insightful and important to his view. Just the discussion of the climatic change influencing the migration patterns of early man was fascinating.
I also found it very interesting that the copies of Tragedy and Hope in the Chicago library system had all been stolen. So I had to buy my own.
Sort of the Hari Seldon of his day. A precursor to the development of Psychohistory.