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From Lexicanum:
Philosophy
Main article: Puritan
Main article: Radical
The Inquisition can be broadly divided into two differing schools of thought: Puritanism and Radicalism.
To the conservative Puritans, it is of the utmost importance that Inquisition doctrine be upheld, and they are often found persecuting those Inquisitors who are deemed heretical.[Needs Citation]
The more pragmatic Radical Inquisitors follow the Imperial doctrines in spirit, believing that the ends justify the means, and find little value in adhering to convention too closely. They often try to fight fire with fire, using Chaos or Xenos weaponry, employing Daemonhosts, or committing other acts that would be deemed heretical by their more conservative brethren.[Needs Citation]
Inquisitors of both sides are found in great number, and while often at odds with each other, are equally interested in the survival of mankind and the defeat of its enemies. Puritans and Radicals are further divided into individual philosophies, leading to further friction.[Needs Citation]