This second point, like the first, is enforced by two illustrations taken from the world of nature. The first was illustrated by the power of bits and rudders; the second is illustrated by the capacity for mischief in fire and in venomous beasts. "Behold, what a fire kindles what a wood!" is the literal rendering of the Greek, where "what a fire" evidently means "how small a fire," while "what a wood" means "how large a wood." The traveller's camp-fire is enough to set a whole forest in flames, and the camp-fire was kindled by a few sparks. "Fire," it is sometimes truly said, "is a good servant, but a bad master," and precisely the same may with equal truth be said of the tongue. So long as it is kept under control it does excellent service; but directly it can run on unchecked, and lead instead of obeying, it begins to do untold mischief. We sometimes speak of men whose "_pens_ run away with them;" but a far commoner case is that of persons whose _tongues_ run away with them, whose untamed and unbridled tongues say things which are neither seriously thought nor (even at the moment) seriously meant. The habit of saying "great things" and using strong language is a condition of constant peril, which will inevitably lead the speaker into evil. It is a reckless handling of highly dangerous material. It is playing with fire.
Yes, "the tongue is a fire. The world of iniquity among our members is the tongue, which defileth the whole body." The right punctuation of this sentence cannot be determined with certainty, and other possible arrangements will be found in the margin of the Revised Version; but on the whole this seems to be the best. The one thing that is certain is that the "so" of the Authorized Version--"_so_ is the tongue among our members"--is not genuine; if it were, it would settle the construction and the punctuation in favour of what is at least the second best arrangement: "The tongue is a fire, that world of iniquity: the tongue is among our members that which defileth the whole body." The meaning of "the world of iniquity" has been a good deal discussed, but is not really doubtful. The ordinary colloquial signification is the right one. The tongue is a boundless store of mischief, an inexhaustible source of evil, a universe of iniquity; _universitas iniquitatis_, as the Vulgate renders it. It contains within itself the elements of all unrighteousness; it is charged with endless possibilities of sin. This use of "world" (κόσμος) seems not to occur in classical Greek; but it is found in the Septuagint of the Proverbs, and again in a passage where the Greek differs widely from the Hebrew (see above, p. 172). What is still more remarkable, it occurs immediately after the mention of sins of speech: "An evil man listeneth to the tongue of the wicked; but a righteous man giveth no heed to false lips. The faithful man has the whole _world_ of wealth; but the faithless not even a penny" (xvii. 4).
"_Is_ the tongue." The word for "is" must be observed (not ἐστι, nor ὑπάρχει, but καθίσταται). Its literal meaning is "constitutes itself," and it occurs again in iv. 4, where the Revisers rightly translate it "maketh himself:" "Whosoever would be a friend of the world _maketh himself_ an enemy of God." The tongue was not created by God to be a permanent source of all kinds of evil; like the rest of creation, it was made "very good," "the best member that we have." It is by its own undisciplined and lawless career that it _makes itself_ "the world of iniquity," that it _constitutes itself_ among our members as "that which defileth our whole body." This helps to explain what St. James means by "_unspotted_" (ἄσπθλον) or "undefiled" (i. 27). He who does not bridle his tongue is not really religious. Pure religion consists in keeping in check that "which _defileth_ (ἡ σπιλοῦσα) our whole body." And the tongue defiles us in three ways;--by suggesting sin to ourselves and others; by committing sin, as in all cases of lying and blasphemy; and by excusing or defending sin. It is a palmary instance of the principle that the best when perverted becomes the worst--_corruptio optimi fit pessima_.