“But it is necessary to the happiness of man, that he be mentally faithful to himself. Infidelity does not consist in believing, or in disbelieving; it consists in professing to believe what he does not believe.”
Source: 1790s, The Age of Reason, Part I (1794)
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Thomas Paine 262
English and American political activist 1737–1809Related quotes

“Faith consists in believing what reason cannot.”
La foi consiste à croire ce que la raison ne croit pas.
"The Flood" (1764)
Citas, Dictionnaire philosophique (1764)

Speech given on November 3, 1936. Quoted in Wir alle helfen dem Führer "Schicksal — ich glaube!" (Munich: Zentralverlag der NSDAP, 1937), pages 103-114

“He is an atheist who does not believe in himself.”
The old religions said that he was an atheist who did not believe in God. The new religion says that he is an atheist who does not believe in himself.
Call to the Nation

“Behavior is what a man does, not what he thinks, feels, or believes.”

“Man is a free agent; but he is not free if he does not believe it”
.
History of My Life (trans. Trask 1967), 1997 reprint, Preface, p. 26
Referenced

“A consistent man believes in Destiny — a capricious man in Chance.”
Book VI, Chapter 22.
Books, Coningsby (1844), Vivian Grey (1826)