“He that blows the coals in quarrels that he has nothing to do with, has no right to complain if the sparks fly in his face. ”

Affurisms. From Josh Billings: His Sayings (1865)

Source: A Theory of Justice (1971; 1975; 1999), p. 217

Source: Meditations (c. AD 121–180), Book VIII, 48

Source: Mastiff

As quoted in "The Quiet German" http://www.newyorker.com/magazine/2014/12/01/quiet-german (1 December 2014), by George Paker, The New Yorker.
2014

"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.

Letter to Henry Asworth (3 September 1864), quoted in John Morley, The Life of Richard Cobden (London: T. Fisher Unwin, 1905), p. 916.
1860s

The Autocrat of the Breakfast Table (1858)

Source: The Space Merchants (1953), Chapter 8 (p. 105)