“What an excellent horse do they lose, for want of address and boldness to manage him! … I could manage this horse better than others do.”

Source: The Aeronaut's Windlass

Ronald Coase in speech to the "International Society of New Institutional Economics" the 17 September 1999, Washington DC. He claims he was quoting fellow economist Ely Devons which reportedly said this in a meeting
1990s and later

Sophia and Luke, Chapter 4 Sophia, p. 64
2009, The Longest Ride (2013)

Advice to her secretary; quoted inThe Kennedys (1984) by Peter Collier and David Horowitz

Source: Protection or Free Trade? (1886), Ch. 2
Context: The needs of labor require more than kind words, and are not to be satisfied by such soft phrases as we address to a horse when we want to catch him that we may put a bit in his mouth and a saddle on his back. Let me ask those who are disposed to regard protection as favorable to the aspirations of labor, to consider whether it can be true that what labor needs is to be protected?
To admit that labor needs protection is to acknowledge its inferiority; it is to acquiesce in an assumption that degrades the workman to the position of a dependent, and leads logically to the claim that the employee is bound to vote in the interest of the employer who provides him with work.
There is something in the very word "protection" that ought to make workingmen cautious of accepting anything presented to them under it. The protection of the masses has in all times been the pretense of tyranny — the plea of monarchy, of aristocracy, of special privilege of every kind. The slave owners justified slavery as protecting the slaves.

According to The quote verifier: who said what, where, and when (2006), Keyes, Macmillan, p. 91 ISBN 0312340044 , the cover of a trade magazine once credited this observation to Churchill, but it dates back well into the nineteenth century, and has been variously attributed to Henry Ward Beecher, Oliver Wendell Holmes, w:Theodore Roosevelt, w:Thomas Jefferson, w:Will Rogers and Lord Palmerston, among others. One documented use in Social Silhouettes (1906) by George William Erskine Russell, p. 218 wherein a character attributes the saying to Lord Palmerston.
Misattributed

All the Pretty Horses (1992)

Source: The Battle for Skandia