“Quaternions came from Hamilton after his really good work had been done, and though beautifully ingenious, have been an unmixed evil to those who have touched them in any way.”

Letter to Robert Baldwin Hayward (1892), as quoted in Energy and Empire : A Biographical Study of Lord Kelvin (1989) by Crosbie Smith and M. Norton Wise

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William Thomson 18
British physicist and engineer 1824–1907

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“Symmetrical equations are good in their place, but 'vector' is a useless survival, or offshoot from quaternions, and has never been of the slightest use to any creature.”

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Letter to G. F. FitzGerald (1896) as quoted in A History of Vector Analysis : The Evolution of the Idea of a Vectorial System (1994) by Michael J. Crowe, p. 120

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“They were not aware of the way of modesty, to distinguish between good and bad. Even though there had been put in man knowledge to be able to call the animals names, there had not been put in him the drive towards evil.”

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“Had Abraham Lincoln died from any of the numerous ills to which flesh is heir; had he reached that good old age of which his vigorous constitution and his temperate habits gave promise; had he been permitted to see the end of his great work; had the solemn curtain of death come down but gradually, we should still have been smitten with a heavy grief, and treasured his name lovingly. But dying as he did die, by the red hand of violence, killed, assassinated, taken off without warning, not because of personal hate, for no man who knew Abraham Lincoln could hate him, but because of his fidelity to union and liberty, he is doubly dear to us, and his memory will be precious forever. Fellow citizens, I end, as I began, with congratulations. We have done a good work for our race today. In doing honor to the memory of our friend and liberator, we have been doing highest honors to ourselves and those who come after us. We have been fastening ourselves to a name and fame imperishable and immortal; we have also been defending ourselves from a blighting scandal. When now it shall be said that the colored man is soulless, that he has no appreciation of benefits or benefactors; when the foul reproach of ingratitude is hurled at us, and it is attempted to scourge us beyond the range of human brotherhood, we may calmly point to the monument we have this day erected to the memory of Abraham Lincoln.”

Frederick Douglass (1818–1895) American social reformer, orator, writer and statesman

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