"It is not possible to refer a..." - Quote by Helen Keller
It is not possible to refer a complex difficulty to a single cause.
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“We believe the world changes when the boldest thinking is directed at the toughest problems”
“Mr. Edison worked endlessly on a problem, using the method of elimination. If a person asked him if he were discouraged because so many attempts proved unavailing, he would say, "No, I am not discouraged, because every wrong attempt discarded is another step forward.".”
“It's always been said that when I can't find a way to do anything, I will find a way to do it.”