"It's necessary to be slightly underemployed if you are to do something significant." 

James Watson, Co-Discoverer of DNA 

"Always remember that it is impossible to speak in such a way that you cannot be misunderstood: There will always be some who misunderstand you." 

Karl Popper 

"No rational argument will have a rational effect on a man who does not want to adopt a rational attitude." 

Karl Popper 

"No experiments are wasted." 

Thomas Edison 

"Whoever lives for the sake of combating an enemy has an interest in the enemy's staying alive." 

Friedrich Nietzsche 

"No matter how many instances of white swans we have observed, that does not justify the inference that all swans are white." 

Karl Popper 

"No one is rich who cannot afford his own army." 

Marcus Crassus, 54 BC. 

"If a cluttered desk is a sign of a cluttered mind, of what, then, is an empty desk a sign?" 

Albert Einstein 

"Sometimes we stare so long at a door that is closing that we see too late the one that is open." 

Alexander Graham Bell 

"We often miss opportunity because it's dressed in overalls and looks like work." 

Thomas Edison 

"We are called to be the architects of the future, not its victims." 

Buckminster Fuller 

"When you have exhausted all possibilities, remember this – you haven't." 

Thomas Edison 

"Whenever a theory appears to you to be the only possible one, takes this as a sign that you have neither understood the theory nor the problem which it was intended to solve." 

Karl Popper