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More from Alexander Graham Bell

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.

When one door closes another door opens; but we so often look so long and so regretfully upon the closed door, that we do not see the ones which open for us.

Attributed

Mr. Watson, come here, I want you.

First words spoken into the telephone (1876)

Before anything else, preparation is the key to success.

As quoted in Sophia's Fire (2005) by Sango Mbella , p. 133

Concentrate all your thoughts upon the work at hand. The sun’s rays do not burn until brought to a focus.

Interview with Bell published in How They Succeeded (1901) by Orison Swett Marden, Ch. 2.