“The more a person believes he’s free to think, the more I believe he’s a slave of his thoughts”

The Human: Truth and Consequences (p. 27)
Straw Dogs: Thoughts on Humans and Other Animals (2002)

From Critique of Everyday Life: Volume 1 (1947/1991)
Context: It is through knowledge that the proletarian liberates himself and begins actively superseding his condition. Moreover in this effort to attain knowledge and awareness, he is forced to assimilate complex theories (economic, social, political...), i. e. to integrate the loftiest findings of science and culture into his own consciousness.
On the other hand the petty bourgeois and bourgeois, as such, are barred access to the human.
For them to become humanized, they must break with themselves, reject themselves, an endeavor which on an individual level is frequently real and pathetic … We should understand men in a human way, even if they are incomplete; conditions are not confined within precise, geometrically defined boundaries, but are the result of a multitude of obstinate and ever-repeated (everyday) causes. Attempts to escape from the bourgeois condition are not particularly rare; on the other hand, the failure of such attempts are virtually inevitable, precisely because it is not so much a question of suppression but of a complete break. (Among intellectuals, this notion of super session is frequently false and harmful; when they supersede themselves as petty-bourgeois or bourgeois intellectuals, they are often merely continuing in the same direction and following their own inclinations in the belief that they are 'superseding themselves'. So far from gaining a new consciousness, they are merely making the old one worse. There is nothing more unbearable than the intellectual who believes himself to be free and human, while in every action, gesture, word and thought he shows that he has never stepped beyond bourgeois consciousness.)

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L 98
Aphorisms (1765-1799), Notebook L (1793-1796)

Source: The Characteristics of the Present Age (1806), p. 21

"What I Believe" in The Forum 84 (September 1930), p. 139; some of these expressions were also used separately in other Mencken essays.
1930s
Context: I believe that religion, generally speaking, has been a curse to mankind — that its modest and greatly overestimated services on the ethical side have been more than overcome by the damage it has done to clear and honest thinking.
I believe that no discovery of fact, however trivial, can be wholly useless to the race, and that no trumpeting of falsehood, however virtuous in intent, can be anything but vicious.
I believe that all government is evil, in that all government must necessarily make war upon liberty and the democratic form is as bad as any of the other forms.
I believe that the evidence for immortality is no better than the evidence of witches, and deserves no more respect.
I believe in the complete freedom of thought and speech — alike for the humblest man and the mightiest, and in the utmost freedom of conduct that is consistent with living in organized society.
I believe in the capacity of man to conquer his world, and to find out what it is made of, and how it is run.
I believe in the reality of progress.
I —But the whole thing, after all, may be put very simply. I believe that it is better to tell the truth than to lie. I believe that it is better to be free than to be a slave. And I believe that it is better to know than be ignorant.

Source: Calculating God (2000), Chapter 24 (p. 227)

IV, 3
Variant translation: The good man, though a slave, is free; the wicked, though he reigns, is a slave, and not the slave of a single man, but — what is worse — the slave of as many masters as he has vices.
The City of God (early 400s)
Context: The dominion of bad men is hurtful chiefly to themselves who rule, for they destroy their own souls by greater license in wickedness; while those who are put under them in service are not hurt except by their own iniquity. For to the just all the evils imposed on them by unjust rulers are not the punishment of crime, but the test of virtue. Therefore the good man, although he is a slave, is free; but the bad man, even if he reigns, is a slave, and that not of one man, but, what is far more grievous, of as many masters as he has vices; of which vices when the divine Scripture treats, it says, “For of whom any man is overcome, to the same he is also the bond-slave.”

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History of My Life (trans. Trask 1967), 1997 reprint, Preface, p. 26
Referenced