“The greatest deception men suffer is from their own opinions.”

Aphorism 50
Novum Organum (1620), Book I
Context: But by far the greatest hindrance and aberration of the human understanding proceeds from the dullness, incompetency, and deceptions of the senses; in that things which strike the sense outweigh things which do not immediately strike it, though they be more important. Hence it is that speculation commonly ceases where sight ceases; insomuch that of things invisible there is little or no observation.

Enver Hoxha (1980) Eurocommunism is Anti-communism https://www.marxists.org/reference/archive/hoxha/works/euroco/env2-1.htm
Writings, Eurocommunism is Anti-Communism
Context: Nevertheless, Marxism-Leninism has not disappeared, it is living and flourishing as an ideology and a reality, materialized in the socialist social system constructed according to its teachings. Exemplifying this is socialist Albania, the Marxist-Leninist parties, and those millions and millions of workers and peasants who are fighting every day for the overthrow of the bourgeoisie, for democracy and national liberation. No force, no torture, no intrigue, no deception can eradicate Marxism-Leninism from the minds and hearts of men.

Addressing the House of Commons shortly after announcing his resignation as speaker
2019
Source: https://www.spectator.co.uk/article/john-bercow-s-seething-contempt-for-brexiteers

The First Part, Chapter 11, p. 50
Leviathan (1651)

Breaking Down the Wall of Silence (Abbruch der Schweigemauer) (1990)

In August 1946, as quoted by James Barber in South Africa in the Twentieth Century, p. 134

Act II, scene 4, line 14 (454).
Variant translations:
There are as many opinions as there are people: each has his own view.
There are as many opinions as there are people: each has his own correct way.
There are as many opinions as there are people: everyone has their own way of doing things.
Phormio

Stanza 27.
Beppo (1818)