I believe there's no proverb but what is true they are all so many sentences and maxims drawn from experience the universal mother of sciences.
Love and war are the same thing and stratagems and policy are as allowable...
It evolved from my experience in the fifties growing up during the McCarthy...
Some of the best fan mail I get are from our men and women in the military and intelligence communities. They say 'Boy you do your homework this is exactly how we're doing it.'