“I have nothing to do with the origin of the primary mental powers, any more than I have with that of life itself.”

— Charles Darwin , book On the Origin of Species (1859)

Source: On the Origin of Species (1859), chapter VII: "Instinct", page 207 http://darwin-online.org.uk/content/frameset?pageseq=225&itemID=F373&viewtype=side
Context: I must premise, that I have nothing to do with the origin of the primary mental powers, any more than I have with that of life itself. We are concerned only with the diversities of instinct and of the other mental qualities of animals within the same class.

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Charles Darwin 161

British naturalist, author of "On the origin of species, by… 1809–1882

Robert Hughes (1938–2012) Australian critic, historian, writer

Things I Didn't Know (2006)

“I do not believe in communism any more than you do but there is nothing wrong with the Communists in this country; several of the best friends I have got are Communists.”

Franklin D. Roosevelt (1882–1945) 32nd President of the United States

Reported by Representative Martin Dies as having been said in a conversation at the White House, in the Congressional Record (September 22, 1950), vol. 96, Appendix, p. A6832. Reported as "exceedingly dubious" in Paul F. Boller, Jr., Quotemanship: The Use and Abuse of Quotations for Polemical and Other Purposes, chapter 8, p. 361 (1967); Boller goes on to say that "it is most unlikely that FDR would have said anything like it, even flippantly, to the zealous HUAC chairman, though he may have told Dies that he was exaggerating the size of the American communist movement".
Misattributed

“More than life, more than honor, I love thee."

More than any crown or throne or title, I love thee. More than any power in faerie, I love thee.”

Laurell K. Hamilton (1963) Novelist

“I have lived longer than you. I have thought more, and I have suffered more. And I tell you there is more truth to the fundamental nature of things in the most foolish fairy tales than there is in any of your complaints against life.”

J.B. Priestley I Have Been Here Before

I Have Been Here Before, Act III.

“I do not believe in any religion, I will have nothing to do with immortality. We are miserable enough in this life without speculating upon another.”

George Gordon Byron (1788–1824) English poet and a leading figure in the Romantic movement

“To it more than anything else I owe whatever success I have had — to this power of settling down to the day's work and trying to do it well to the best of my ability, and letting the future take care of itself.”

William Osler (1849–1919) Canadian pathologist, physician, educator, bibliophile, historian, author, cofounder of Johns Hopkins Hospi…

Remarks at a farewell dinner address in New York (20 May 1905), later published in Aequanimitas, and Other Addresses (1910 edition), p. 473.
Context: I have had three personal ideals: One to do the day's work well and not to bother about tomorrow. You may say that is not a satisfactory ideal. It is; and there is not one which the student can carry with him into practice with greater effect. To it more than anything else I owe whatever success I have had — to this power of settling down to the day's work and trying to do it well to the best of my ability, and letting the future take care of itself.
The second ideal has been to act the Golden Rule, as far as in me lay, toward my professional brethren and toward the patients committed to my care.
And the third has been to cultivate such a measure of equanimity as would enable me to bear success with humility, the affection of my friends without pride, and to be ready when the day of sorrow and grief came, to meet it with the courage befitting a man.
What the future has in store for me, I cannot tell — you cannot tell. Nor do I care much, so long as I carry with me, as I shall, the memory of the past you have given me. Nothing can take that away.