Silence is more expressive than words, but if you do smth in silence - you have a double power!

........ Were you looking for the translation? Or if there's a similar one in spanish? Only ones i can think of in this moment are un gesto dice mas que mil palabras (an 'action' is worth more than a thousand words) mucho ruido pocas nueces (too much noise too few nuts... used when someone is a loudmouth ;P)