Entire ignorance is not so terrible or extreme an evil, and is far from being the greatest of all; too much cleverness and too much learning, accompanied with ill bringing-up, are far more fatal.plato
It is fatal to be a man or woman pure and simple: one must be a woman manly, or a man womanly. Virginia Woolf
It never seems to occur to some people, that, like beauty, a sense of humor may sometimes be fatal. Edgar Rice Burroughs
Success is not final, failure is not fatal: it is the courage to continue that counts. Winston churchill
The worst mistake of first contact, made throughout history by individuals on both sides of every new encounter, has been the unfortunate habit of making assumptions. It often proved fatal.David Brin
Too much mercy... often resulted in further crimes which were fatal to innocent victims who need not have been victims if justice had been put first and mercy second. Agatha Christie