Light travels faster than sound. This is why some people appear bright until you hear them speak. Remember, amateurs built the ark. Professionals built the Titanic. Conscience is what hurts when everything else feels so good.
Talk is cheap because supply exceeds demand.
Even if you are on the right track, you'll get run over if you just sit there. Politicians and diapers have one thing in common. They should both be changed regularly and for the same reason. An optimist thinks that this is the best possible world. A pessimist fears that this is true.