Enrico Fermi

"The mind is like a parachute—it works best when it's open."

"In the long run, the market is a weighing machine."

"Knowledge is the power to act."

"The greatest discoveries often come from the simplest observations."

"What is the answer? And upon reflection, what is the question?"

"Do not worry about your difficulties in mathematics; I assure you that mine are still greater."

"The nuclear bomb is the instrument of our time."

"Quantity is no substitute for quality."

"Human beings make life so interesting."

"Progress is made by questioning everything."

"I would say that the most important lesson that we may learn from this incident, is that we have an infinite number of problems and only very little experience."

"The best leaders are those who know when to follow."

"Fear is the mind's way of protecting us from what we don't understand."

"Mathematics is the language in which God has written the universe."

"What we have done is open up a new world; it is up to others to explore it."

"There are no shortcuts to any place worth going."

"The universe is a funny place."

"Learning is not attained by chance, it must be sought with ardor and attended to with diligence."

"Imagination is more important than knowledge. Knowledge is limited."

"The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails."

"Death is just another word for change."

"Everything of importance has been said before by somebody who did not discover it."

"I've always believed that if you put in the work, the results will come."

"The moment we think we know it all, we have stopped learning."

"Hope is not the same as optimism. It is based on very hard-headed analysis of the current situation and available resources."

"Be kind whenever possible. It is always possible."

"There is no substitute for hard work."

"Beauty is the pursuit of truth expressed in form."

"The music of the spheres is the harmony of the universe."

"Patience is the virtue that makes all other virtues possible."