“I can hire one half of the working class to kill the other half.”
Frequently attributed, often in the context of strikebreaking activities during the Great Southwest Railroad Strike of 1886. See for example Philip Sheldon Foner, History of the Labor Movement in the United States, Volume 2 - Page 50 (1975). A contemporary source has not been identified. Varying forms of the quotation circulated in the labor press as early as 1893, with or without the attribution to Gould.
Attributed
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Jay Gould 10
American businessman 1836–1892Related quotes

“One half of my life has put the other half in the grave.”
La moitié de ma vie a mis l’autre au tombeau.
Chimène, act III, scene iii.
Le Cid (1636)

http://www.tufts.edu/home/feature/?p=commencement2007&p4=4
Education

On Grace & Free Choice, chap 14.(de Gratia Et Libero Arbitrio), Daniel O'Donovan, trans., Introduction, Bernard McGinn, Cistercian Publications, 1988, p. 37. https://books.google.com/books?id=ODcqAAAAYAAJ&q=%22not+as+if+grace+did+one+half+of+the+work+and+free+choice+the+other%22&dq=%22not+as+if+grace+did+one+half+of+the+work+and+free+choice+the+other%22&hl=en&sa=X&ved=0ahUKEwjT7I76jK_TAhUFNiYKHZrCB3gQ6AEIODAE (Note: Fr. Harry J. McSorley, C.S.P. Commenting on this teaching of Bernard, states: "We are indebted to Bernard of Clairvaux … for the clarification that grace and free will are not related as partial causes - which would be a false synergism - but as total causes of the act of justification, each on its own proper plane. Bernard maintains the Catholic-Augustinian tradition by insisting that man's natural freedom (liberum arbitrium) remains even after the fall. It is a wretched, but nonetheless integral free will. This natural freedom of the will, possessed by the just and sinners alike, enables us to will, but not to will what is good. It is grace alone that gives us good will." Luther, Right or Wrong, (1969), Newman Press / Augsburg Publishing House, p. 133 https://books.google.com/books?id=KaRAAAAAIAAJ&pg=PA133&dq=%22for+the+clarification+that+grace+and+free+will+are+not+related+as+partial+causes%22&hl=en&sa=X&ved=0ahUKEwjX5fjGjK_TAhUKRSYKHdmfBCsQ6AEIIjAA#v=onepage&q=%22for%20the%20clarification%20that%20grace%20and%20free%20will%20are%20not%20related%20as%20partial%20causes%22&f=false
Context: It’s not as if grace did one half of the work and free choice the other; each does the whole work, in its own peculiar contribution. Grace does the whole work, and so does free choice – with this one qualification: That whereas the whole is done in free choice, so is the whole done of grace.

Source: Stan Lee, “1993: Jack Kirby: The Hardest Working Man in Comics by Steve Pastis” https://kirbymuseum.org/blogs/effect/category/interview/, Happening Magazine, (1993) by Steve Pastin; as quoted by Rand Hoppe, The Kirby Effect The Journal of the Jack Kirby Museum & Research Center, (28 April 2018).