Law 30
Your actions must seem natural and executed with ease. All the toil and practice that go into them, and also all the clever tricks, must be concealed. When you act, act effortlessly, as if you could do much more. Avoid the temptation of the revealing how hard you work – it only raises questions. Teach no one your tricks or they will be used against you. –Robert Greene, The 48 Laws of Power (review)