"As one reads mathematics, one needs to have an active mind, asking questions, forming mental connections between the current topic and other ideas from other contexts, so as to develop a sense of the structure, not just familiarity with a particular tour through the structure."

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Mysteries simply are a feast for an active mind. And while in my lifetime I've seen science make extraordinary inroads into solving the most complex questions of life, after all this time I admit that I am thrilled that there are some things that forever will remain a mystery. For example, do I wear a toupee?

— William Shatner