The 30th Law of Power:

“Everything Must Look Effortless“

What you achieve must appear natural and effortless. Conceal how much hard work, experience, and clever tricks are behind it. When you begin, do it with ease, as if you could accomplish much more. Resist the temptation to reveal how hard you work — it only raises questions. Do not share your tricks with anyone, or they might be used against you.

(by Robert Greene)