"Sincerity is all that counts. It's a widespread modern heresy. Think again. Bolsheviks are sincere. Fascists are sincere. Lunatics are sincere. People who believe the earth is flat are sincere. They can't all be right. Better make certain that you've got something to be sincere about and with."

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The war against Russia is an important chapter in the German nation's struggle for existence. [...] The objective of this battle must be the demolition of present-day Russia and must therefore be conducted with unprecedented severity. Every military action must be guided in planning and execution by an iron resolution to exterminate the enemy remorselessly and totally. In particular, no adherents of the contemporary Russian Bolshevik system are to be spared.

— Franz Halder