The commenter is right: Sun Tzu got there first (Art of War, VII.36).
Mao Tse Tung, who enjoyed advertising his own cruelty and ruthlessness, famously defied the sage:
The sky is spinning and the earth upside down
We are elated
Yet we must use our courage to chase the hopeless enemy.
So Dave Cameron, who seems to get stupider and more ridiculous by the hour, is emulating Mao Tse Tung. Or thinks he is. Or something.