“While the people retain their virtue and vigilance, no administration, by any extreme of wickedness or folly, can very seriously injure the government in the short space of four years.”

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

Source: The Cabinet Council (published 1658), Chapter 25

Letter to Emile Kahn (1 October 1881)
Diary and Letters of Rutherford Birchard Hayes (1922 - 1926)
Context: One of its [James A. Garfield’s assassination] lessons, perhaps its most important lesson, is the folly, the wickedness, and the danger of the extreme and bitter partisanship which so largely prevails in our country. This partisan bitterness is greatly aggravated by that system of appointments and removals which deals with public offices as rewards for services rendered to political parties or to party leaders. Hence crowds of importunate place-hunters of whose dregs Guiteau is the type. The required reform [of the civil service] will be accomplished whenever the people imperatively demand it, not only of their Executive, but also of their legislative officers. With it, the class to which the assassin belongs will lose their occupation, and the temptation to try “to administer government by assassination” will be taken away.

Source: The Political Thought of Abdullah Ocalan (2017), Democratic Confederalism, p. 39

Interviewed in 1982 about Margaret Thatcher's attitude towards him and his government.[citation needed]
Post-Prime Ministerial

As quoted in After the Holocaust: Rebuilding Jewish Lives in Post War Germany (1997) by Michael Brenner

Source: This Law of Ours and Other Essays (1987), Chapter: Calling All Muslims, Radio Broadcast # 7, p 116

David Hughes, "'Don't flutter around us' Blair warns lobbyists", Daily Mail, 8 July 1998, p. 2.
After a scandal about lobbying and access; this statement is often misremembered as "whiter than white".
1990s

Article 15
Virginia Declaration of Rights (1776)