“If we suspect that a man is lying, we should pretend to believe him; for then he becomes bold and assured, lies more vigorously, and is unmasked.”

Falsehood in Wartime (1928), Introduction
Context: Lying, as we all know, does not take place only in war-time. Man, it has been said, is not "a veridical animal," but his habit of lying is not nearly so extraordinary as his amazing readiness to believe. It is, indeed, because of human credulity that lies flourish. But in war-time the authoritative organization of lying is not sufficiently recognized. The deception of whole peoples is not a matter which can be lightly regarded.
A useful purpose can therefore be served in the interval of so-called peace by a warning which people can examine with dispassionate calm, that the authorities in each country do, and indeed must, resort to this practice in order, first, to justify themselves by depicting the enemy as an undiluted criminal; and secondly, to inflame popular passion sufficiently to secure recruits for the continuance of the struggle. They cannot afford to tell the truth. In some cases it must be admitted that at the moment they do not know what the truth is.

Variant translations:
Above all, do not lie to yourself. A man who lies to himself and listens to his own lie comes to a point where he does not discern any truth either in himself or anywhere around him, and thus falls into disrespect towards himself and others. Not respecting anyone, he ceases to love, and having no love, he gives himself up to passions and coarse pleasures, in order to occupy and amuse himself, and in his vices reaches complete bestiality, and it all comes from lying continually to others and to himself. A man who lies to himself is often the first to take offense. It sometimes feels very good to take offense, doesn't it? And surely he knows that no one has offended him, and that he himself has invented the offense and told lies just for the beauty of it, that he has exaggerated for the sake of effect, that he has picked on a word and made a mountain out of a pea — he knows all of that, and still he is the first to take offense, he likes feeling offended, it gives him great pleasure, and thus he reaches the point of real hostility… Do get up from your knees and sit down, I beg you, these posturings are false, too.
Part I, Book I: A Nice Little Family, Ch. 2 : The Old Buffoon; as translated by Richard Pevear and Larissa Volokhonsky, p. 44
The Brothers Karamazov (1879–1880)

Frida's quote On Diego Rivera, in 'Portrait of Diego' [Retrato de Diego] (22 January 1949), first published in Hoy (Mexico City) and posthumously (17 July 1955) in Novedades (Mexico City): "México en la Cultura"
1946 - 1953

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 16.

The Mysterious Affair at Styles (1920)

"Aftermath" in the Baltimore Evening Sun http://www.positiveatheism.org/hist/menck05.htm#SCOPESD (14 September 1925)
1920s
Context: Once more, alas, I find myself unable to follow the best Liberal thought. What the World's contention amounts to, at bottom, is simply the doctrine that a man engaged in combat with superstition should be very polite to superstition. This, I fear, is nonsense. The way to deal with superstition is not to be polite to it, but to tackle it with all arms, and so rout it, cripple it, and make it forever infamous and ridiculous. Is it, perchance, cherished by persons who should know better? Then their folly should be brought out into the light of day, and exhibited there in all its hideousness until they flee from it, hiding their heads in shame.
True enough, even a superstitious man has certain inalienable rights. He has a right to harbor and indulge his imbecilities as long as he pleases, provided only he does not try to inflict them upon other men by force. He has a right to argue for them as eloquently as he can, in season and out of season. He has a right to teach them to his children. But certainly he has no right to be protected against the free criticism of those who do not hold them.... They are free to shoot back. But they can't disarm their enemy.
The meaning of religious freedom, I fear, is sometimes greatly misapprehended. It is taken to be a sort of immunity, not merely from governmental control but also from public opinion. A dunderhead gets himself a long-tailed coat, rises behind the sacred desk, and emits such bilge as would gag a Hottentot. Is it to pass unchallenged? If so, then what we have is not religious freedom at all, but the most intolerable and outrageous variety of religious despotism. Any fool, once he is admitted to holy orders, becomes infallible. Any half-wit, by the simple device of ascribing his delusions to revelation, takes on an authority that is denied to all the rest of us.... What should be a civilized man's attitude toward such superstitions? It seems to me that the only attitude possible to him is one of contempt. If he admits that they have any intellectual dignity whatever, he admits that he himself has none. If he pretends to a respect for those who believe in them, he pretends falsely, and sinks almost to their level. When he is challenged he must answer honestly, regardless of tender feelings.