"When one door closes, another opens; but we often look so long and so regretfully upon the closed door that we do not see the one which has opened for us."
"Don't keep forever on the public road, going only where others have gone and following one after the other like a flock of sheep. Leave the beaten track occasionally and dive into the woods."
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Source: Episodes in the History of Modern Algebra (1800-1950). Book edited by Karen Hunger Parshall and Jeremy J. Gray, September 6, 2007.
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"The day will come when the man at the telephone will be able to see the distant person to whom he is speaking."
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"The only difference between success and failure is the ability to take action."
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