Here we have an account of another vision the apostle was favoured with, between the sounding of the sixth trumpet and that of the seventh. And we observe,
I. The person who was principally concerned in communicating this discovery to John - an angel from heaven, another mighty angel, who is so set forth as would induce one to think it could be no other than our Lord and Saviour Jesus Christ! 1. He was clothed with a cloud: he veils his glory, which is too great for mortality to behold; and he throws a veil upon his dispensations. Clouds and darkness are round about him. 2. A rainbow was upon his head; he is always mindful of his covenant, and, when his conduct is most mysterious, yet it is perfectly just and faithful. 3. His face was as the sun, all bright, and full of lustre and majesty, Rev 1:16. 4. His feet were as pillars of fire; all his ways, both of grace and providence, are pure and steady.
II. His station and posture: He set his right foot upon the sea and his left foot upon the earth, to show the absolute power and dominion he had over the world. And he held in his hand a little book opened, probably the same that was before sealed, but was now opened, and gradually fulfilled by him.
III. His awful voice: He cried aloud, as when a lion roareth (Rev 10:3), and his awful voice was echoed by seven thunders, seven solemn and terrible ways of discovering the mind of God.
IV. The prohibition given to the apostle, that he should not publish, but conceal what he had learned from the seven thunders, Rev 10:4. The apostle was for preserving and publishing every thing he saw and heard in these visions, but the time had not yet come.
V. The solemn oath taken by this mighty angel. 1. The manner of his swearing: He lifted up his hand to heaven, and swore by him that liveth for ever, by himself, as God often has done, or by God as God, to whom he, as Lord, Redeemer, and ruler of the world, now appeals. 2. The matter of the oath: that there shall be time no longer; either, (1.) That there shall be now no longer delay in fulfilling the predictions of this book than till the last angel should sound; then every thing should be put into speedy execution: the mystery of God shall be finished, Rev 10:7. Or, (2.) That when this mystery of God is finished time itself shall be no more, as being the measure of things that are in a mutable changing state; but all things shall be at length for ever fixed, and so time itself swallowed up in eternity.

A little book open - Meaning probably some design of God long concealed, but now about to be made manifest. But who knows what it means?
His right foot upon the sea, and his left - on the earth - To show that he had the command of each, and that his power was universal, all things being under his feet.

And he had in his hand a little book open,.... By which is meant not the Bible, the Scriptures of the Old and New Testament; or the book of the Gospel, the substance of which lies in a little room, and is no other than the preaching of Christ, and him crucified, as God's way of salvation; and which is now more open and manifest, and more clearly made known unto the sons of men, under the Gospel dispensation, than it was before, and especially since the time of the Reformation, to which this book, and the prophecies of it, may have respect; but the same book is here designed, which in Rev 5:1 is represented as in the right hand of him that sat on the throne, as shut and sealed; but the lion of the tribe of Judah, the Lamb in the midst of the throne, having taken it out of his hand, unloosed its seals, and opened it; and whereas we never read of his laying this book down, or of his delivering it to any other, he may be well supposed to be this mighty angel, who held it open in his hand: it may be said to be "a little book", because now not only many of the scenes and visions in it were exhibited, upon the opening of the seals; but because, at the time this vision refers to, many of its prophecies were accomplished, so that the bulk of it was greatly reduced; and it may be represented as "open", because the seals of it were unloosed, and the things in it revealed; and it is to be observed, that as the several seals of this book, and the opening of them, refer to the state of the empire, both as Pagan and as Christian, as has been seen; so the little book itself, clear of these seals, sets forth the state and condition of the church in the empire, under its different revolutions and appearances:

and he set his right foot upon the sea, and his left foot on the earth; which signifies that he was Lord and possessor of both, of the whole terraqueous globe, being the Maker and supporter of it; and that his Gospel should be spread all over the world, both on the continent and in the islands of the sea; and that his kingdom should be from sea to sea, and from the rivers to the ends of the earth; that the abundance of the sea should be converted to him, or the maritime parts of the world should be subject to the sceptre of his grace and government; and that the earth, and the uttermost parts of it, should be his possession, though it was now almost wholly in the hands of the Turk and pope; and it may be observed, that he set his foot upon both earth and sea, out of which the two beasts arise, Rev 13:1, which shall be destroyed by him.

he had--Greek, "Having."

in his hand--in his left hand: as in Rev 10:5 (see on Rev 10:5), he lifts up his right hand to heaven.

a little book--a roll little in comparison with the "book" (Rev 5:1) which contained the whole vast scheme of God's purposes, not to be fully read till the final consummation. This other, a less book, contained only a portion which John was now to make his own (Rev 10:9, Rev 10:11), and then to use in prophesying to others. The New Testament begins with the word "book" (Greek, "biblus"), of which "the little book" (Greek, "biblaridion") is the diminutive, "the little bible," the Bible in miniature.

upon the sea . . . earth--Though the beast with seven heads is about to arise out of the sea (Rev 13:1), and the beast with two horns like a lamb (Rev 13:11) out of the earth, yet it is but for a time, and that time shall no longer be (Rev 10:6-7) when once the seventh trumpet is about to sound; the angel with his right foot on the sea, and his left on the earth, claims both as God's, and as about soon to be cleared of the usurper and his followers.