“Always behave like a duck- keep calm and unruffled on the surface, but paddle like the devil underneath.”

“Be like a duck. Calm on the surface, but paddling like the dickens underneath.”

“Be a duck, remain calm on the surface and paddle like hell underneath.”

“Consider how hard it is to change yourself and you'll understand what little chance you have in trying to change others. ”

“Whoever you are, there is some younger person who thinks you are perfect. There is some work that will never be done if you don't do it. There is someone who would miss you if you were gone. There is a place that you alone can fill.”

“Don't show it and don't panic. Do like the ducks; on the surface stay calm, and below it paddle lile hell”

“Science, like art, is not a copy of nature but a re-creation of her.”