“My whole life has been spent trying to teach people that intense concentration for hour after hour can bring out in people resources they didn't know they had.”
"A Talk with Polaroid's Dr. Edwin Land" in Forbes Vol. 115, No. 7 (1 April 1975), p. 49
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Edwin H. Land 44
American scientist and inventor 1909–1991Related quotes

“No hour of life is lost that is spent in the saddle.”
My early life, 1874–1904 (1930), Churchill, Winston S., p. 45 (1996 Touchstone Edition), ISBN 0684823454
My Early Life: A Roving Commission (1930)

Knuth versus Email http://www-cs-faculty.stanford.edu/~knuth/email.html

Source: The Captain is Out to Lunch and the Sailors Have Taken Over the Ship

“Not heaven itself upon the past has power;
But what has been, has been, and I have had my hour.”
Book III, Ode 29, lines 69–72.
Imitation of Horace (1685)
Context: Be fair, or foul, or rain, or shine,
The joys I have possessed, in spite of fate, are mine.
Not heaven itself upon the past has power;
But what has been, has been, and I have had my hour.

Quoted in "What Hitler Knew: The Battle for Information in Nazi Foreign Policy" - by Zachary Shore - 2003

After the announcement of the death sentence.
Source: Bartłomiej Kuraś, Witold Pilecki – w Auschwitzu z własnej woli, „Ale Historia”, w: „Gazeta Wyborcza”, 22 kwietnia 2013.

[as quoted by Joseph F. Mulligan, American journal of physics, Volume 66 (9), American Association of Physics Teachers, American Institute of Physics, 1998, 797]