The Greatest Wisdom Often Consist In Ignorance.

No One Demands More Caution Than A Spy, And When Someone Has The Skeleton Key To Minds, Counter Him By Leaving The Key Of Caution Inside, On The Other Side Of The Keyhole.

Know How To Play The Card Of Contempt. It Is The Most Politic Kind Of Revenge. For There Are Many Of Whom We Should Have Known Nothing If Their Distinguished Opponents Had Taken No Notice Of Them. There Is No Revenge Like Oblivion, For It Is The Entombment Of The Unworthy In The Dust Of Their Own Nothingness.

Two Kinds Of People Are Good At Foreseeing Danger: Those Who Have Learned At Their Own Expense, And The Clever People Who Learn A Great Deal At The Expense Of Others.

Advice Is Sometimes Transmitted More Successfully Through A Joke Than Grave Teaching.

Watchfulness Is The Only Guard Against Cunning. Be Intent On His Intentions. Many Succeed In Making Others Do Their Own Affairs, And Unless You Possess The Key To Their Motives You May At Any Moment Be Forced To Take Their Chestnuts Out Of The Fire To The Damage Of Your Own Fingers.