“The problems we face now – poverty and violence at home, war and destruction abroad – will last only as long as we continue relying on the same politicians who created them. A change in leadership is required to change these outcomes.”

Source: The Summing Up (1938), p. 306

Principles and Priorities : Programme for Government (September 5, 2007)

As quoted in Our Generation Against Nuclear War (1983) by Dimitrios I. Roussopoulos.

Variant: A change of environment is the traditional fallacy upon which doomed loves, and lungs, rely.
Source: Lolita

Said in a Fox Business interview https://www.facebook.com/FoxBusiness/posts/weve-been-conditioned-to-think-that-only-politicians-can-solve-our-problems-but-/10153892947535238/ (February 9, 2016)

Harvard University address (1978)
Context: Even if we are spared destruction by war, our lives will have to change if we want to save life from self-destruction. We cannot avoid revising the fundamental definitions of human life and human society. Is it true that man is above everything? Is there no Superior Spirit above him? Is it right that man's life and society's activities have to be determined by material expansion in the first place? Is it permissible to promote such expansion to the detriment of our spiritual integrity?
If the world has not come to its end, it has approached a major turn in history, equal in importance to the turn from the Middle Ages to the Renaissance. It will exact from us a spiritual upsurge, we shall have to rise to a new height of vision, to a new level of life where our physical nature will not be cursed as in the Middle Ages, but, even more importantly, our spiritual being will not be trampled upon as in the Modern era.
This ascension will be similar to climbing onto the next anthropologic stage. No one on earth has any other way left but — upward.

To My People (July 4, 1973)
Source: Assata: An Autobiography

Recently often attributed to Ordway Tead.
Attributed to Antony Jay in older sources, see: Public Administration Review (1977). Vol. 15. p. 20.
Also called "Jay's Laws of Leadership", see: Paul Dickson (1999) The official rules and explanations. p. 33. This source states:
Jay's Laws of Leadership
#Changing things is central to leadership, and changing them before anyone else is creativeness.
#To build something that endures, it is of great importance to have a long tenure in office-to rule for many years. Quick success can be achieved in a year or two, but nearly all great tycoons have continued their building much longer.
Disputed