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The most important tool in chemistry is not the flask or the spectrometer—it's the imagination.

"To read is to travel without moving an inch."

"Books are the windows to other lives."

Good can exist without evil， whereas evil cannot exist without good.

The individual can understand his own experience and gauge his own fate only by locating himself within his period, that he can know his own chances in life only by becoming aware of those of all individuals in his circumstances.