The silence of a treacherous man is to be feared even more than his words

Man was given a tongue with which to speak and words to hide his thoughts. 

Man was given a tongue with which to
speak and words to hide his thoughts. 

A person's character is revealed by their speech

Poor in my youth, and in life's later scenes - Rich to no end, I curse my natal hour, Who naught enjoyed while young, denied the means; And naught when old enjoyed, denied the power

Success has many friends