http://www.esquire.com/entertainment/tv/a33392/leonard-nimoy-what-ive-learned/?spr_id=1456_152373401

Best piece of advice I ever got was from John F Kennedy when I was driving a taxi in and out of the Hotel Bel-Air. He was a senator then. I was just out of the army and I needed to make some money, so I got to talking about the difficulty of making a living as an actor. And he said, “Just keep in mind, there’s always room for one more good one.”