Jeff Cooper Quotes
No sensible person ever opens the door of his house without knowing who is knocking.
Citations
Cooper, Jeff. Principles of Personal Defense. Paladin Press, 2006.
Related Quotes
This is one of the rare proverbs dealing with the importance of intelligence and foreknowledge.
John Dean "Jeff" Cooper was a United States Marine, the creator of the "modern technique" of handgun shooting, and an expert on the use and history of small arms.