There are two Greek words, very different from one another in origin and history, which are used both in the Septuagint and in the New Testament to express the unseen and spiritual powers of evil. These are διάβολος and δαιμόνιον, or in one place δαίμων (Matt. xlii. 31; _not_ Mark v. 12, or Luke vii. 29, or Rev. xvi. 14 and xviii. 2). The Scriptural usage of these two words is quite distinct and very marked. Excepting where it is used as an adjective (John vi. 70; 1 Tim. iii. 11; 2 Tim. iii. 3; Titus ii. 3), διάβολος is one of the names of Satan, the great enemy of God and of men, and the prince of the spirits of evil. It is so used in the Books of Job and of Zechariah, as well as in Wisdom ii. 24, and also throughout the New Testament, viz. in the Gospels and Acts, the Catholic and Pauline Epistles, and the Apocalypse. It is, in fact, a proper name, and is applied to one person only. It commonly, but not invariably (1 Chron. xxi. 1; Ps. cviii. [cix.] 5) has the definite article. The word δαιμόνιον, on the other hand, is used of those evil spirits who are the messengers and ministers of Satan. It is thus used in Isaiah, the Psalms, Tobit, Baruch, and throughout the New Testament. It is used also of the false gods of the heathen, which were believed to be evil spirits, or at least the productions of evil spirits, who are the inspirers of idolatry; whereas Satan is never identified with any heathen divinity. Those who worship false gods are said to worship "demons," but never to worship "the devil." Neither in the Old Testament nor in the New are the two words ever interchanged. Satan is never spoken of as a δαίμων or δαιμόνιον, and his ministers are never called διάβολοι. Is it not a calamity that this very marked distinction should be obliterated in the English Version by translating both Greek words by the word "devil," especially when there is another word which, as the margin admits, might have been used for one of them? The Revisers have done immense service by distinguishing between _Hades_, the abode of departed spirits of men, and _Hell_ or _Gehenna_, the place of punishment (iii. 6). Why did they reject a similar opportunity by refusing to distinguish _the devil_ from _the demons_ over whom he reigns? This is one of the suggestions of the American Committee which might have been followed with great advantage and (so far as one sees) no loss.