My name is Legion. The devil was compelled by Christ to pronounce this word, that he might more fully display the greatness and excellence of his grace. There must have been good reasons why this man should have endured so severe a punishment as to have an army of devils, so to speak, dwelling within him. What compassion then was it, to rescue from so many deaths a man who was more than a thousand times ruined! It was a magnificent display of the power of Christ., that by his voice not one devil, but a great multitude of devils, were suddenly driven out. Legion denotes here not a definite number of men, but merely a great multitude. Hence it is evident what a wretched creature man is, when he is deprived of the divine protection. Every man is not only exposed to a single devil, but becomes the retreat of vast numbers. This passage refutes also the common error, which has been borrowed by Jews and Christians from the heathens, that every man is attacked by his own particular devil? On the contrary, Scripture plainly declares, that, just as it pleases God, one devil is sometimes sent to punish a whole nation, and at other times many devils are permitted to punish one man: as, on the other hand, one angel sometimes protects a whole nation, and every man has many angels to act as his guardians. There is the greater necessity for keeping diligent watch, lest so great a multitude of enemies should take us by surprise.

My name is Legion - See the notes at Matthew 8:29.

Legion: for we are many - Could a disease have spoken so? "No, there was no devil in the case; the man spoke according to the prejudice of his countrymen." And do you think that the Spirit of God could employ himself in retailing such ridiculous and nonsensical prejudices? "But the evangelist gives these as this madman's words, and it was necessary that, as a faithful historian, he should mention these circumstances." But this objection is destroyed by the parallel place in Luke, Luke 8:30, where the inspired writer himself observes, that the demoniac was called Legion, because many demons had entered into him.

And he asked him, what is thy name?.... Which question Christ put, not for his own sake; for he was not ignorant of his name, nor of the number of the unclean spirits which were in the man; but partly, that it might be known what a miserable condition this poor man was in, being infested, and vexed with such a large company of devils; and partly, that his own pity and power in delivering him, might be more manifest;
and he answered, saying, my name is Legion: the Syriac version renders it, "our name is Legion"; the reason of which name is given,
for we are many: as a Roman legion did consist of many, though its number was not always alike: in the time of Romulus, a legion consisted of three thousand foot, and three hundred horse; afterwards, when the city was, increased, of six thousand foot, and six hundred horse; sometimes it was six thousand and two hundred foot, and three hundred horse; sometimes four thousand foot, and three hundred horse; sometimes five thousand foot, and three hundred horse (x). Some make a legion to consist of six thousand six hundred sixty six; and others make it much larger, even twelve thousand five hundred: however, the number in a legion was many; hence the word is retained among the Jews, and is used for a large number, either of persons or things; as, , "a legion of olives" (y): that is, a large number of them; though sometimes it is used of a single person, who has others under him, as the general of an army: thus it is said (z) that one man should say to another,
"from whence art thou? he replies, from such a "legion" am I;--the man went to the legion--the legion heard, and was afraid--the man said, woe unto me! now will the legion slay me--the legion heard, &c.''
And again (a),
"a certain legion asked R. Abba, is it not written, &c.''
Once more (b),
"Lo! such a legion shall go with thee, to keep thee, &c.''
Upon which the gloss is, , "the general of an army"; so called, because he had a legion, or a large number of soldiers under his command: and just so this unclean spirit is called by this name, because he had a great many more with him, and under him, in that man; sometimes it is only used of a single person himself, as of a king's servant sent into a foreign country, to collect his (c) tax: a legion was reckoned by the Jews unclean and defiled, whatsoever place they entered into (d); how much more unclean must this man be, that had a legion of unclean spirits in him! From hence it appears, that the devils are very numerous; for if there was a legion of them in one man, how many must there be in all the children of disobedience, to maintain their ground, and support their interest among them? As there is an innumerable company of holy angels to encamp about the saints, and do them all the service they can, and axe appointed to; so there is undoubtedly an innumerable company of devils, who do all the hurt they can, or are permitted to do, unto the sons of men: hence they are expressed by words, which signify number as well as power; as principalities and powers, the rulers of the darkness of this world, spiritual wickedness in high places, the power or posse of the air, the angels of Satan, the angels that sinned and left their habitations, &c. As also that they are in a body, and in the form of an army; with a general at the head of them, the prince of devils, and king of the bottomless pit: there are whole squadrons and regiments of them, yea, even legions; which are formed in battle array, and make war against Christ, the seed of the woman; as they did when he was in the garden, and hung upon the cross, which was the hour and power of darkness; and against his members; as they did in Rome pagan against the Christian church, and in Rome papal, against the same, Revelation 12:7, and what a mercy it is for the saints, that besides twelve legions of good angels and more, which are ready to assist and protect them, they have God on their side, and therefore it signifies not who is against them; and they have Christ with them, who has spoiled principalities and powers; and greater is the Holy Spirit that is in them, than he that is in the world.
(x) Alexander ab Alex. Genial. Dier. l. 1. c. 5. Liv. Hist. l. 8. c. 8. (y) Bereshit Rabba, sect. 20. fol. 17. 4. (z) Zohar in Genesis. fol. 96. 4. & Ivare Binah in ib. (a) Ib. in Exod. fol. 50. 2. (b) Zohar in Exod. fol. 51. 4. (c) Vajikra Rabba, sect. 30. fol. 170. 4. & Mattanot Cehuna in ib. (d) T. Bab. Cholin, fol. 123. 1.

And he asked him, What is thy name?--The object of this question was to extort an acknowledgment of the virulence of demoniacal power by which this victim was enthralled.
And he answered, saying, My name is Legion: for we are many--or, as in Luke (Luke 8:30) "because many devils [demons] were entered into him." A legion, in the Roman army, amounted, at its full complement, to six thousand; but here the word is used, as such words with us, and even this one, for an indefinitely large number--large enough however to rush, as soon as permission was given, into two thousand swine and destroy them.

My name is Legion! for we are many - But all these seem to have been under one commander, who accordingly speaks all along, both for them and himself.