“Freedom only for the members of the government, only for the members of the Party — though they are quite numerous — is no freedom at all. Freedom is always the freedom of dissenters. The essence of political freedom depends not on the fanatics of 'justice', but rather on all the invigorating, beneficial, and detergent effects of dissenters. If 'freedom' becomes 'privilege', the workings of political freedom are broken.”

Source: The Russian Revolution (1918), Chapter Six, "The Problem of Dictatorship"

Source: 1960s–1970s, The Constitution of Liberty (1960), p. 83.

unsorted
Science and Human Values (1956, 1965)

from Gandhi and Philosophy: On Theological Anti-politics

2000s, 2008, Address to the United Nations General Assembly (September 2008)
Context: To uphold the Charter's promise of peace and security in the 21st century, we must also confront the ideology of the terrorists. At its core, the struggle against extremists is a battle of ideas. The terrorists envision a world in which religious freedom is denied, women are oppressed, and all dissent is crushed. The nations of this chamber must present a more hopeful alternative, a vision where people can speak freely, and worship as they choose, and pursue their dreams in liberty.

Speech delivered at the second congress of the peace partisans (April 14, 1959).
Principles of the 14th July Revolution (1959)

Source: Irrational Man: A Study in Existential Philosophy (1958), Chapter Ten, Sartre, p. 215