Perseverance must have some practical end, or it does not avail the man possessing it. A person without a practical end in view becomes a crank or an idiot. Such persons fill our asylums.
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About Alexander Graham Bell
Alexander Graham Bell was a 19th-century inventor of the telephone. Alexander Graham Bell was a Scottish-born Canadian-American inventor, scientist, and engineer who is credited with patenting the first practical telephone. He also co-founded the American Telephone and Telegraph Company (AT&T) in 1885. Read more on Wikipedia →