“Infidelity does not consist in believing, or in disbelieving; it consists in professing to believe what he does not believe.”
Source: The Age of Reason
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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)

Source: The Unabridged Devil's Dictionary

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

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

“He does not believe that does not live according to his belief.”

Petronius, as depicted in the novel, speaking to Marcus Vinicius,<!-- entirely fictional character, NOT the historical figure. --> in Ch. 1
Quo Vadis (1895)
Context: Pliny declares, as I hear, that he does not believe in the gods, but he believes in dreams; and perhaps he is right. My jests do not prevent me from thinking at times that in truth there is only one deity, eternal, creative, all-powerful, Venus Genetrix. She brings souls together; she unites bodies and things. Eros called the world out of chaos. Whether he did well is another question; but, since he did so, we should recognize his might, though we are free not to bless it.

“A nihilist is not one who believes in nothing, but one who does not believe in what exists.”
Part 2: Metaphysical Rebellion
The Rebel (1951)