And he had in his hand a little book open: and he set his right foot upon the sea, and his left foot on the earth,
He had - `having.'
In his hand - in his left hand: as in Revelation 10:5 (note), he lifts up his right hand to heaven.
A little book - a roll, little in comparison with the "book" (Revelation 5:1) which contained the whole vast scheme of God's purposes, not to be read until the consummation. The less book contained only a portion which John was now to make his own (Revelation 10:9; Revelation 10:11), then to use in prophesying to others. The New Testament begins with "book" х biblos (G976)], of which the "little book" х biblaridion (G974)] is the diminutive, the Bible in miniature.
Upon the sea ... earth. Though the beast with seven heads is to arise out of the sea (Revelation 13:1), and the beast with two horns like a lamb (Revelation 13:11) out of the earth, yet it is but for a time, and that time shall no longer be (Revelation 10:6-7), when once the seventh trumpet is to sound. The angel with his right foot on the sea and his left on the earth, claims both as God's, and as soon to be cleared of the usurper and his followers.