"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."
"The final result of our researches has widened the class of substances sensitive to light vibrations, until we can propound the fact of such sensitiveness being a general property of all matter."
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Source: Statement to the American Association for the Advancement of Science, Boston, Massachusetts August 27, 1880. Published as On the Production and Reproduction of Sound by Light, American Journal of Sciences, Third Series, Volume XX, No.118, pp. 305-324, October 1880.
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